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you need to tell us what type of hot water tank you have - give us some details off the badge. is the drip constant? Is the drip hot or cold?

Are your cold taps mains fed? Does the overflow happen when you use a particular appliance eg washing machine? Thermostatic mixing shower? It 'could' be crossflow - mains cold getting into the hot system.

I would say to pump both hot & cold - if your CWT is about 50gallons (227 Litres) then you should be fine. We use a Stuart Turner Monsoon 2bar twin impeller, negative head pump on one of our products, where the water board wont allow unvented cylinders in flats. The pump delivers about...

as they say, 27" is fine. If an immersion is side entry, maximum immersed length is 50mm less than the diameter of the cylinder. If top entry then max immersed length is 200mm less than the height of the cylinder. CCM

What is heating the hot water? Electric immersion heater? Solid Fuel fire/stove gas/oil Boiler? What temperature is the hot water cylinder sitting at?

As a manufacturer, I havent had anything official to say its approved, but like you, I have heard that it is passed. It has been used by some installers so I have to assume that BC ok'd it, but it wouldnt be the first time that an unvented was installed without the proper procedures being...

If the BM is an older model, with no pump for the Hot Water, you may have a faulty Thermostatic mixing valve. Personally, I like Doitalls suggestion, but then again, I'm Biased :)

EITHER you have a leak in your coil in the HWC OR, as bripl says, its a 'single feed indirect' - primatic is a trade name (used a bit like 'hoover'). The heat exchanger (its not a coil) is designed to let the CWST fill both the cylinder and the CH system but not allow any CH system water back...

I dont want to sound like a pedant, but slugbaby isnt completely right, and if Bilbo is taking it further, he should get it spot on. The benchmark book isnt a legal requirement - some manufacturers provide one to keep a servicing record for the guarentee, but not every unvented cylinder has...

Ok You are looking for a motorised zone valve (the make depends on who's cylinder you have had installed) on the flow to the primary coil in the cylinder. There is no ambiguity in the regs - you either fit it, or you have not got a legal installation. Every manufacturer will supply one...

It sounds like an airlock in your primary F&R to the cylinder. - are you getting heat to the rads? Also, the unvented cylinder will have been supplied with a 2 port Motorised zone valve (a legal requirement if the unit is approved) - make sure this is fitted and controlled properly to ensure...