I suppose it depends whether said pictures / T-shirts also have the words "XH558" on them or not......after all , "XH558" is apparently copyrighted.
As for photos of XH558 { or any other aircraft or exhibit , for that matter }.....as discussed on the old Forum , that could also be legally "iffy" , if the photo was taken on private property or at an organised airshow / event { If you read the entry tickets / T&Cs , you'll usually find something along the lines of : "The Ticket Holder shall not without the Organisers' prior written consent sell, license, or otherwise exploit, or attempt to exploit, any material whether written or in the form of digital or photographic film, sound, video or other recording or computer software obtained or made at the Showground" }











