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"The Radiator Company" http://www.theradiatorcompany.co.uk/ may be able to help.

You could even up the pressure a bit to force any air to high spots

Did it overheat through lack of circulation? If so there may be a reset button that needs pressing to get the boiler running again.

Read the Instructions!

http://www.mcalpineplumbing.com/waste-pipe-fittings/chrome/chrome-plated-brass-fittings/32mm-euro-cp-brass-90-deg-compression-bend.html?id=122&cat=122 This may help, but it is designed for European Pipe, you will need 35A-CB to connect to UK size pipe. If the joint is not going to be visible...

Anyway, back to the 'Question'... different boilers have different flue sizes and different types of flue, so 100, 125, 150mm maybe, we don't know what make of boiler, heat output or flue configuration, so don't ask a lame question without any detail. Some flues are horizontal (Grant) while some...

Major Ball Supp... S plan on three circuits required. UFH takes ages to warm up and ages to cool down so should come on independently of the main heating circuit.

Sometimes the plastic thread gets worn and you cannot get a decent connection. If this is the case fit a newer style valve by Fluidmaster, that has a brass threaded shank to connect to. Fluidmaster own Oppella now I believe and Torbeck valves are also available with a brass shank. Have a look at...

Loctite 55... never let me down... ...yet.

Your oil tank is on ply, roofing felt and wooden joists... not the recommended way to support it... fire hazard.

Most plastic tanks don't have a sludge cock.

You can syphon water out at the bottom of the tank without taking the oil out.

I hate converting a system with pipes in concrete to sealed pressurised system for this very reason. "It was alright 'til you changed it" could be a hard argument to win with some customers.

Never seen copper pipe crack like that.

How did you cut the copper 15mm pipe?

High pressure cold water and low pressure cold water?

Port A goes to heating, Port B goes to water heating

Thermal store I expect

Do you have a Flue Gas Analyser and oil pressure gauge?

McAlpine = The Best.... IMHO