Right, we have a happy ending. After taking some reassurances from the engine builder, I bolted the starter in. The main battery cable didn't reach. I was going to use the wiring in place from the solenoid and use a "link" wire on the starter. But as I had some wiring work to do, I bit the bullet and rewired to remove the solenoid as well. That took some time and a new battery cable, but the results are much simpler and tidy. And to the main news. Re-connected the ignition to get sparks, turned the key, cranked and fired into life not a drama or even a slowing, super duper. Not really going to know the problem - wrong number of teeth on the starter pinion? Just not man enough? My engine builder consulted a starter expert who actually said he didn't think 9 or 10 teeth would make much difference with 110 teeth on the ring gear - who knows? Now I need to find time to get it on the rolling road to set up the carbs and the timing, get an MoT, some insurance and tax (not in that order) and we are blat-ready! Thanks everyone for the help and encouragement. Fab as always. Graham