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.............well, as I said, today was the day when my daughter's boyfriend and his dad came round to change the 'new' pump to see if that was at fault (process of elimination) . Well on doing this nothing changed, still no circulation round the primary circuit. Now bearing in mind my system...

No that's fine, it's sometimes the obvious things that get overlooked. And yes, the arrow on the pump points the same way as the original pump did, flowing up through the 3 port valve and into the top feed of the coil into the HW Cyl.

Both the gate valves either side of the pump are open, I removed the pump again to confirm this.

Yes, the rads don't get hot at all, execpt the small one in the shower room which is behind the airing cupboard. Althogh this takes about 30 mins of the pump running to heat up.

Yes, there is a bleed point just before the primary circuit goes in to the HW cylinder. I have bled loads of water from this, but it still does not seem to shift it.

My SMC pump,after 25 years service became very noisy (like the bearings were shot - squealing noise) so I thought I would fit a new one. Because the Union connectors were very tight - 24" stilsons would not budge it and I didn't want to disturb any joints in and around the HW Cylinder- I had...