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Me too ! I've been wanting to add one to my collection for years, so look forward to seeing what the kit is like.
Looking forward to seeing an Airfix 1/48th Blenheim, as the CA kits cost a King's Ransom and your first born, when they appear on a certain auction site !
Neat kit.
I read somewhere about the wheels being a bit small, and I believe there are resin wheels available - again, Hannant's should have them.
As for decals, there are some around, but it's probably easier to get Xtradecal sheets of roundels and code letters which, of course, can also be used for future projects.
If you are unable to get another vac-form turret, then that Contrail example should polish-up, and after a dip in 'Future' should be OK.
EDIT:- I've just checked the Hannant's web-site, and resin wheels are available at £5.70 - a touch expensive if you don't really want to change the kit wheels.
There isn't a vac-form set of canopies in this scale - I must be thinking of 1/72nd scale, in one of the multiple sets.
The only RAF Blenheim decals are for the Mk.1, apart from a Coastal Command, 1940 Mk.IV, which is part of a set for Defence of Britain (!), which includes other aircraft types on the sheet.