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If you want use flat faced isolation valves just replace existing iso and compression elbow. Use existing nuts/cones I would personally add a smear of joining compound (for potable water) onto cones .

Extending stack to a similar high as your existing would certainly solve problem But I would try changing existing air admittance valve for a new one that's intended for external use.

The Grant combi's can be 'difficult ' to clear of air the air valve on the return will probably need opening a number of times. Never ever use the on/off switch on the boiler when it much more than a year old they break for fun! If you need power off just pull plug out . Assuming you have the...

If your competent to work with mains voltage and you have a multimeter box lid off. Disconnect orange wire from valve to radiators. When thermostat calling for heat and zone valve open you should have live on orange. Honeywell do a really good app, honeywell wireing guide download to your...

We spent over 10 years subcontracting to a specialist insurance contractor. This sort of job was everyday stuff. Rip out everything damp rotten and lose (probably the whole floor and shower base) commercial dehumidifier in dry out and start again. I would seriously check out your house...

Send clear pictures to showerdoc.com

Just use small screws just one normal required. Back in mist's of time key terrain made brackets that were made to take a screw to stop this problem. I've still got a few see pic.

Speedfit tee Push down collet back into nut it will slide off pipe. Reassemble don't tighten nut dead tight! Push pipe back in tighten nut. They are ment to be demountable.

Be extremely careful changing that auto air valve. Spanner on socket it goes into first that copper pipe its attached to distorts/leaks for fun.

I'm old enough to have installed asbestos soil pipes they certainly exist! Normal joint technique was yarn rope then sand and cement. What you have appears to be CI but as advised check with magnet. That joint is straightforward sand/cement.

Grant did have a batch of faulty plate to plate heat exchanges at one point. We changed several under warranty. As above physical disconnect filling loop as first check. The combis can be quite difficult to clear of air. If yours has mostly manual air valves the one on return often needs...

As above just abandoned the gas fire. I did loads of that type of flue on newbuild back in day . Even when new odd ones we could never get to pass spillage test. Horrible things.

Look online several companies sell them very easy to install and fully compliant

I've have a rems electric pipe freeze machine that we have used on plastic pipework up to 28mm. Also used our larger CO2 set on plastic pipe with no problem (it's much quicker).

If you intended digging in properly maybe have a look at insuduct much easier method.

Failed micro switch on a motorised valve would be favourite. If your OK testing mains voltage go into heating junction box check if live on orange from valves. If live then identify which valve.

If your competent to work with mains voltage check if permanent live on orange from hot water valve. Stuck mircro switch well known problem.

I asked the plumber at the time about the testing and he said air testing is fine. I would seriously question his knowledge and competence.

As above should be filled with water then pressure tested. Has the floor screed been done?

Depending on access shouldn't be too difficult to re route pipework a lot of plumbing can be like keyhole surgery!