Update on this.
On chatting to Greg at Kernow I followed the suggestions of Greg & Kaput above.
The settings suggested seem spot on.
I fitted the Lenz decoder & am testing it on a rolling road.
The settings suggested seem to work wonderfully well, Thank you.
I won't mention those door handrails which seemed to be glued in & well, awful to work with.
I can see modellers having a lot of trouble with these.
Here's hoping I never have to go in there again.
Not a good design at all.
Anyway a lovely model despite the design of those handrails.
Well done to Kernow.
Regards.
Tony.