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If they shared the same heat exchanger, what stopping hot water from over heating if heating is in used? Daniel.

Unvented cylinder and system boiler is the better way. Daniel.

That is the old hot feed from cupboard, where possible old hot water cylinder used to be, to bathroom. Cut that 22mm pipe a few inches from tee and cap it off. Daniel.

Pinhole leak, surface paint keeping water in. Radiator is faulty, take it back to shop. Daniel.

That is fine, keep turning till it stop. Daniel.

Probably the shower tray base is dusty. Use StickLike and put it even all over the base as long the mortar is set and hard. Daniel.

Should take the shower back to shop as parts is missing and no instruction as well. Daniel.

Need to take a photo of the whole installation so we can tell. Daniel.

Look like the cylinder leaking by the look of cylinder feet. Can you check the base of cylinder to see if it is wet. Also check the discharge pipe tundish isn't leaking or running. Daniel.

Yes, it'll be fine. Daniel

Why is plastic pipe not allowed? Daniel

Don't put the tank on top of kitchen unit bottom shelf. Daniel.

About right, 2 days work. What make is the boiler and unvented cylinder? Daniel.

The front cover need to be removed in order to access the PCB Daniel.

Are you sure the stopcock is original? Have you tried turning off underground stopcock? Have you asked your nextdoor about their stopcock? I have come across some where they fitted stopcock under sink and claimed it is the main stopcock when in fact it tee off the original rising main so it...

Yes but why? It is set by who commissioned it and altering fan speed may affect air balanceing to each rooms. It should be service by a gas safe engineer. Daniel.

Don't need any of these, plumbers use eyes to perfection. Daniel.

Probably stuck. Give it a wiggling, tap it with hammer, to try loose it up. If fail, buy this and try it: http://www.screwfix.com/p/rothenberger-manhole-key-with-extended-handle-520mm/9638k Daneil.

Check if there is stopvalve, gate valve or lever valve isn't clogged. At 3 bars, that is fine, but you need to put more flow in it to clear it. Pigging with a ball bearing might be a good idea but risk getting stuck. You will need a strong air pressure to push it all the way to the end. 80...

This one don't have a screw, this waste flange is holding back by the back nut. There are two different type of bath waste fitting. Op, unscrew the back nut and the whole thing will come out, if stuck, cut through nut is the only way. Daniel.