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Peter Brown in Part 3 of his series "The A13 Cruiser", published on Military Modelling, Vol. 40, No. 14 2010, quoting 5RTR diary, states that Cruiser A13 Mk II A T9175 was in France as part of "C" Squadron of that battalion. So we know that Bronco markings for that tank should be correct at least regarding serial number and AOS number (it should be on a green square though). I concur with Andrew that 5 RTR tactical insignia for a BEF tank should be blue and not yellow.
5 RTR managed to bring back to Britain six A13, so there is the possibility of T9175 being one of them.
In Part 5 of Peter Brown's above mentioned serie there is a picture of a column of 5 RTR A13 in England (AOS 63), the first tank T15251, named "Edgecumbe" bears what appears quite dark tactical signs, definitely not yellow, so Bronco markings are not correct for that scenario either.
May I suggest you to take a look to Armoured Acorn (armouredacorn.com)? There are some sections dedicated to BEF tanks and British Cruisers you may find helpful.
I think that if you build T9175 with a 10 AOS number on a green square and blue tactical sign you should be on reasonably safe ground.
I'm no expert on British tank, I only try to put together all the informations I can find.