1) No idea what scale the Scalextric model is. Ask nicely in an LMS if you can measure one up maybe? 2) As Ratch says above, Airfix did a 1/24 scale kerbside TR7 coupe, which is the right model TR7-8 for your BA project, and even comes with Minilite wheels, which you'll probably want. 3) The only other version I can think of other than diecasts is a Revell TR8 convertible in 1/25 scale, which is the wrong body, and came with Weller 8 spoke steel wheels.