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A light bulb went on when you mentioned possible DIY install, what's the betting it's a combi conversion, and Mr DIYer has got the pipework wrong under the floor, so that for example the flow is going down what was the old cylinder return, or something similar? This happened to me when...

I never use gate valves now because they seize quite quickly, or never close properly when you want them to. Use a lever valve instead.

Join the two valves together with some temporary bodge plastic pipe, open valves and turn heating on, you'll know then.

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Outrageous I reckon.

Do you have a dead body in the loft you don't want them to find?

That pipe is nothing to do with your air lock

Have another beer, problem will disappear

Yes

This, of course assumes the pump is fitted the right way round.

Did I mention this possibility earlier?

Tell him to do one.

If you're sure the fault is shower related only, and definitely doesn't happen with hot taps, then I'd be looking at shower valve.

I would have thought that could be solved using a plume management kit as in pic 5, you'll need a gas bod to install it .

It's a universal backplate, any other will fit.

Others will disagree, but in that situation, I would fit new olive, gently tighten nut in order to compress olive, then wrap 3-4 wraps of PTFE around new olive and refit valve.

I once came upon one with that problem, previous idiot had got flame sense cable mixed with ignition cable

Could possibly be intermittent shower issue, dodgy thermostat maybe.

Please bear in mind BTW toilets are a pain to maintain because invariably they have to come out to remove cistern for simple repairs.

Don't forget the squirrells