Established in 2002 by industry veterans Trish Gray and Ian Smith, TGIS Aviation embodies a fusion of Trish’s prowess in Engine Management and Ian’s expertise in Aircraft Management.

Over the years, the company has evolved into a robust collective of Technical Experts, each with over 35 years of experience spanning Airlines, MROs, and OEMs. Complementing our core team is our network of international consultants who are renowned for their technical capability and experience.

Trish Gray


Trish was initially trained by Rolls-Royce and became their first female technical service representative based in Luton, England and Tel Aviv, Israel.

She subsequently joined Air 2000/First Choice as a Powerplant Engineer and then moved to bmi as Powerplant Manager. By the time she left, Trish was General Manager of Technical Support.

Since 2002, Trish has been a consultant, offering powerplant asset management support to airlines and lessors. She has extensive experience in the engine industry including financial management, technical support and contract negotiations.

Trish’s specialisms include: expert witness, contract negotiations, engine life-time cost reviews, pre-purchase and mid-term audits/inspections, engine overhauls, on-wing engine management, delivery and redelivery support as well as the selection/purchasing of aircraft engines.

Ian Smith

Chief Operating Officer

Ian joined British Airways in 1978 and trained as an Engineering Apprentice. After qualifying, he went on to work for British Midland Airways, Air Europe, Airworld Aviation and Air 2000/First Choice. He has held a string of managerial positions including: Aircraft Maintenance Manager, Head of Maintenance Control and Heavy Maintenance Manager.

For over 20 years, Ian worked in aircraft technical lease management and aircraft transitions. He has also been a consultant to the airlines, asset management companies and lessors.

Ian’s specialisms include: aircraft asset management technical services, the management of assets between owners and operators, lease technical management, oversight of heavy maintenance checks, pre-purchase reviews, mid-term audits, record inspections, aircraft deliveries, repossessions and general guidance on technical matters.

Charlie Whyman

Managing Director

Charlie was invited to join TGIS Aviation as Managing Director after consulting with the company on their commercial strategy and operations. Charlie has been involved in running businesses since 2006 and has worked across multiple industries including Mining, Forensics, Commercial Shipping, Surveying and all things Geospatial. Charlie originally studied engineering and has worked with engineers for over 20 years. She brings a wealth of experience to the role blending her experience in business management with her interest in engineering.

Charlie is also an international keynote speaker and prior to joining TGIS, Charlie ran her own consulting business for 6.5years.

Terry Bateman

General Manager: Technical and CAM

Terry Bateman joined TGIS in 2024 as our General Manager Technical. With over fifty years in aviation, Terry brings a wealth of experience and expertise.

Terry has worked some industry renowned organisations which include TP Aerospace, 2Excel, RVL Group, and DHL-Air, gaining valuable insights along the way. Terry's got a solid grasp of crucial regulations, for example Design Organisation Approval (21J), Production Organisation Approval (21G), and Maintenance Organisation Approval (145), and he's well-connected with authorities like EASA, UK CAA, FAA, and more.

From his early days as a Rolls Royce apprentice to leadership roles at major European airlines, Terry's career is a testament to his dedication and professionalism. And his consultancy work with banks and leasing companies speaks volumes about his industry expertise.

Terry’s specialisms include: contract negotiations, asset management, maintenance management, continued airworthiness management, aircraft & engine inspections, lease transitions, and project management.

Paul McGregor

Head of Powerplant

With a background in OEM engine manufacturer and repair, Paul has over 26 years of experience across a broad spectrum of roles within Rolls-Royce plc and a further 6 years consulting with Rolls-Royce plc.

Paul’s involvement in high level projects has drawn upon his ability to implement technical solutions to complex issues. A highly conscientious and professional individual committed to providing resolutions on a wide variety of customer issues using technical and relationship building skills whilst aiming to meet business and customer expectations.

Paul’s specialisms include: Asset management including finance portfolios, engine acquisitions and disposals, pre-purchase inspections, asset repossession, engine lease returns, engine pre-lease technical data sets, aircraft check technical management, on-time project delivery, engine shop visit management, aircraft pre-purchase inspections, engine exchange contract negotiations, aircraft redelivery project management.

Henrik Rajz

Powerplant Specialist

Henrik began his career at Malev Hungarian Airlines in 1983. Progressing from Engineer to Senior Engineer and finally Powerplant Manager, Henrik then moved from Hungary to the UK and took a position at Willis Asset Management Ltd (formerly TES Aviation). There he worked as a consultant within multiple areas of Powerplant and APU Engineering.

Most recently, Henrik has been working as an Independent Contractor on behalf of Atlas Air and CargoLogicAir. A Hungarian native, Henrik is fluent in English and has been a resident of the UK since 2012.

Henrik’s specialisms include: all areas of engine technical and asset management.

Stephen Harrison FCCA

Finance Manager

Stephen Harrison, Finance Manager, is a valued member of the TGIS Aviation Team and is responsible for the organisation’s financial matters. He has worked in finance for almost 20 years including 15 years in various roles at the Association of Chartered Certified Accountants (ACCA).

Stephen’s role is central to our organisation in supporting and implementing the latest operational procedures for the business. He is a welcome addition to TGIS Aviation and further strengthens the skills and knowledge of our growing team.

Stephen also has a BA (Hons) in Music and in his spare time enjoys singing in Lichfield Cathedral Choir and playing bass in a variety of bands including a jazz trio, covers band, and tribute act.