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Not doing me out of a job :) quite simply you should not touch anything gas related unless you are competant, most rgi`s won`t sign off your pipework either. You can connect all pipework to the new boiler bar the gas. And tell me how will the rgi check your pipework if you have it buried behind...

You should not be laying the pipework for the gas at all.

it can be inside, the trouble may be when digging the footings the gas main (which is the yellow pipe) may not be deep enough to allow the footings in, if this is the case your best bet is to get the box moved as the pipe would need to be cut anyway.

Lets wait and see what the op says :lol:

If he has cut half way through your joists they are ruined, you can`t cut more than 1/4 of a notch into a joist before you cause major weakness in it. Although if they are cut half way through i can`t for the life of me figure why the 22mm pipe won`t sit in enough for the boards to be laid back?

When you blew down the pipe did you make sure the tap was open :) Sounds like a blockage to me though. look in this thread for how to fix it http://www.diynot.com/forums/viewtopic.php?t=172571&start=0

Thats fine gas pipe does not need to be boxed nor lagged. Yes they should repair any damage they did when installing, Have they left the pipwork proud of the joists so the boards won`t rest on them? see question 1 This is fine when the job is done.

only 5 or 6 years old and corroded? that should not happen, best bet, measure the sizes and look online for something as close as possible, if they are only 5-6 years old then you should easily find the same sizes.

Your overflow is dripping, which means the inlet valve is not closeing properly and the cwst is overflowing. change the inlet and you should stop the drip :)

http://www.tradingdepot.co.uk/DEF/product/!!CFI301REP22!!/D002001/Plumbing/Plastic%20Plumbing%20Fittings/Compression%20Fittings/Repair%20Coupling%2022mm%20x%2080mm

Should the f&e tank not be higher than the cws tank? At least thats what i was thought.

I`ve never seen tails (15 to 8mm i assume) on basin taps before, weird. But at a guess it is simply not tightened up enough, i can`t imagine why it only leaks when you use the shower maybe something to do with the change in pressure.

water will find it`s own level, leave a tap run for a few minutes and the level will drop back to normal.

It`s leaking i`d say it`s to late for at least one of those rads :)

Flush pipework first, then install pump. thats how i do them.

that is incorrect, you can use the combi for the central heating only.

No need to drain the system, nor to use ptfe tape on a compression joint, all you should have to do is tighten the nuts which are loose.

nope thats fine what your going to do

from the link you posted As it is mains fed and your mains pressure should be more than 2 bar then i figure you`ll have no trouble with the larger shower head nor the 2bar requirement.

you may have supplied them but you did not fit them, i very much doubt that the rads are at fault, tell the plumber to stop bullshitting you and come back and balance the system properly.