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For cheap and cheerful might be worth giving the Siku super die-cast range of toys a look; most of those appear to be either 1:50th or 1:55; can usually be found on eBay for a few quid a pop
I will have a look at what I have that might be of use to you, problem isI am hopeless on vehicle scales. I tend to go with what I think looks OK.If I find anything I will bring it to Bob's next Saturday. Should fit in, as he isdoing Modern.