Many thanks for your kind words and encouragement chaps ... I must admit I feel as though I'm on the offramp now (Ooo! can't you just tell I'm a bit of a "Weather Report" fan)?
Anyhoo, I want this put to bed so I'm reaching for the finishing tape. And one of the things that needed addressing (to my eye) was the wheels themselves. Now I don't understand all the prototypical ettiquette, but the wheels themselves are made up of two pancake halves, having put enough cement between to make sure there was no dry patches I clamped them up, but only after the devils own job at trying to line them up - they just weren't concentric.
So, I had to play around like this..................................

Firstly I turned them down, not the easiest thing as the plastic is quite greasy and very soft - hence the visible "chatter" and that was going very gently.

Next there was two laminate wraps cemented to the outer tyre.

And then of course this was turned down to a tyre-ish shape. ............. This is the first turning with a bit of grey primer thrown at it to allow me to see what I've got ... and it's a bearable start? Certainly better than what I started with.
This can obviously be fettled up to one's hearts content, but that ridge around the one o'clock position looks to my eye like a line of caked mud sticking to the tyre - doubt if I could of modelled it any better? I shall of course neaten them up, but I'm tempted to leave that line of mud.
That's it for now then - hopefully a finished pic' soon???
Cheers all.................