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when the ch and dhw are turned off, is the boiler completely dead. I.e. No lights at all including the big blue one?

You've got them by the short and curlies! Get them back to investigate the problem . You could insist on getting the pump changed. If the pumps has got isolation valves it shouldn't take more than 20 minutes to change. However the problem could be the 3 port valve. It might not be sending...

Sorry I missed the sealed part of the OP but he doesn't say the boiler is a combi. This boiler comes in a number of types i.e. conventional, system and combi.

We could do with some more details. Do you have an S plan or Y plan system or something else? You've spent nearly a grand on materials alone and nobody changed a 50 quid pump? When the heating comes on check the rads and see if one gets very hot very quickly. This would indicate the system...

Did you spot the flue hidden in the wall?! At least those gas pipes are sleeved not that they need it considering halve the wall is missing!

Looks like something that belongs on the side of a battleship.

I saw this while in east London. All the gas pipework is in 28mm but it's still going a huge way over the top of the building. And then there are the flue/vents!. There's another flue in the bottom right coming out of the air grill/vent.

Something ain't right here.

Looks like 3 flues jammed between 3 soil vents. Or the vents could be open flues!. Whats even more curious is how are the boilers arranged on the other side!.

I discovered that info in a Transco document a couple of years ago. It's long since been removed from their web site. I think the problem was not directly pressure drops but if the neighbour next door wanted a new gas supply, the contractors were tapping into the nearest service pipe which often...

Is the ducting yellow and perforated to allow gas to escape? Here are the National Grid links for charging, http://www.nationalgrid.com/uk/Gas/Charges/statements/connection/publications/ Go to page 2 of this document for the money shot...

I recently did a job where we removed a J&S warm air unit and put in a wet system. What astounded me was the warm air unit was only ducted to the main living room lounge. There was no ducting going to the upstairs bedrooms/bathroom. The labour involved was huge. So without seeing the exact...

Is it the intention to have a 15mm gas supply to a boiler in the loft?

Here is the Corgi technical bulletin. http://www.jacktroop.co.uk/corgistuff/corgi%20tech%20bulletin/TB_218_Gas_in_Flats_Requirement_to_install_FSDs_on_flueless_gas_appliances_%2806.08%29.pdf

It's only when removed from the boiler that the full horror is revealed. The flue is completely split. This was not obvious when the flue was in-situ as the split was facing the back of the boiler.

Hadn't been serviced for 3 or 4 years.

There are signs of heat damage and blistering on the flue.

If you bend them before screwing them into the bloc, you won't get them both in the bloc as they''ll hit each other or the sink. Always best to get rid of the copper tails and get a couple of flexible hoses. They cost about £10. Just be careful you get the correct size hose, generally the tap...