I agree with both comments above.
However if the sadist in you still wants to go the plastic route. There is nothing available in the UK that will fit. (that I am aware of)
In the US there is a heli kit called a 'Little Bird' for what I think is their GI Joe series of action figures.
Quite a few have converted those and the evidence is here on RR.
But to second Trek, look at the TT fuz's or the Century/funkey ones, most of them will pretty much fit.
For reference, in modelling terms, the ratio works as such:
The larger the second number in the ratio the smaller the model
So 1:35 is one inch of measurement on your kit is 35 inches on the full size.
Therefore 1:6th is 1 inch = 6inches etc.
Kits go right down to 1:600 for big model ships.
Conversersly 1:2 is HALF scale!
Hope this helps your quest.
After scale everything else is a toy!