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OK, that makes sense. Many thanks for your help Nige, the advice is much appreciated. Thanks to Corgiman too.

Getting any more pipes up into the loft from the tank wouldn't be that difficult. Getting more pipes right through from the boiler would be nigh-impossible without wrecking most of the house in the process. What would be involved in going pumped? I assume it's a bit more complicated than...

Nige, I think you have it bang-on. Many thanks. Yes, the top pipe was up near the top of the tank, just below the dome. The new one has the top pipe about 1/2 way up the tank. Now I know what to google for, it definitely looks like it was an annulus system. I still have the old tank...

Just my luck. First post and I get hit by the resident troll. http://www.flayme.com/troll/

Thanks Corgiman. Now I understand why Legion seems to be at cross-purposes too, which would explain why his posts don't make sense (even ignoring his shining wit). I'm not getting hot water even the following morning. The boiler runs from 5:00am to 7:30am every morning; there should...

So how does using the hot water from the cylinder at the top of the circuit make a difference to the gravity system starting up again?

Are you saying that a gravity circuit will only start if there is already hot water at the top of the system i.e. in the tank?

Yes, that bit's easy. But why isn't the boiler putting more hot water back into the cylinder?

Sorry, was that supposed to be a useful comment? I didn't solve it, the system still stops working when somebody runs a bath.

This system was installed in the 70s - a basic gravity hot-water system fed directly from the boiler. There's also a pumped heating system, using separate connections from the boiler. This works fine. No diverter valves, as far as I know. Both systems use different outlets on the boiler...