Back again, sorry folks.
After all the advice I've had here, I've decided on what to do, so I went off to a couple of large plumbers suppliers darn Basildon, and got totally blanked.
If I didn't want a combi installed, I could naff off, and even though I could see Albion indirect cylinders in the yard, they weren't going to discuss flogging them or other bits. Pointless me mumbling about no stored water, or not brilliant mains flow even when the pressures ok.
Also you lot know naff-all about piping, or anything else.
(Considering these two were in competition, they seemed to have very similar hymnsheets, in fact, thinking back, I think they were clowns, sorry clones......spooky.)
So I'm going to have to get my bits off the net, which I don't much like as I like to know what I'm getting.
So - the plan is to put in an indirect vented HW cylinder, 100 litres ish, Albion springs to mind, but you may know better.
Also a boost pump, about 1 bar - do they come variable speed, or should I adjust if need be with a valve?
I want to replace all stopcocks and gate valves with ball valves, but of course I want them to be full bore.
Same for the 3 port valve, or 2 through valves if I use S plan, but I'd as soon use Y plan if I can get a full bore valve..
So can you advise on these components, I don't want to buy them and then find I've got some manky flow stranglers, and it doesn't look as if I'll be able to check for meself.
Sorry to intrude yet again, but it seems all the helpful pro plumbers (Hi Ed) live here.
TIA
mike