An hour on the car this evening found the following.
There's definitely fuel through as a hose split on the front carb and petrol sprayed out ;D
There isn't a spark at the plugs tho :-/.
Tried a brand new plug, no difference.
Swapped leads and dizzy cap over from the spare TR7 Sprint - no difference
That surely means no power reaching the distributor - then I noticed the spare TR7 had different connections at the coil so I put BRP to the same configuration and
NO DIFFERENCE :'(