Arclite01
I have had a look at the Marshalls website and it would seem that their composite expertees ( if the website is correct ) is in the construction of pre-preg autoclaved composites.
This is a very different game to the repair of epoxy foam sandwich composite structures.
Slngsby did build this type of structure with the T67 but most of this expertees has disbursed since Marshalls took over and they did not often repair this type of structure.
The expertees in repairing this type of is now almost totally within the UK gliding industry and very few glider repair companies have the EASA145 maintenance oversight ( basicly public transport standard ) as most of them are working under EASA part M sub part G & F via BGA oversight. The MoD rightly require a minimum of EASA145 oversight for subcontractors doing this work.
Babcock have for some time been astute enough to realise that they don't have the expertees to do composite repairs to their Grob Tutor fleet, so they subcontract out any damage repaire work to an EASA145 approved company who specialise in this work, this is a well worn process as the Grob Tutors are on the civil register and the paperwork can exclusively be handled under EASA145. The Viking recovery is a little more difficult as the Military are imposing their airworthiness oversight on the project.
The bottom line is SERCO & Marshalls have been floundering around for 20 or so months with something they don't really understand and achieved very little Babcock are the newcomers to this project having come to it in about May this year and have with their policy of subcontracting experts to do the work got two gliders flying in the face of SERCO obstruction and reams of MoD paperwork.