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You do realise ventillation requirements of boilers comes under gas safety law...and guessing at it can have serious consequences.

Ventillation requirements for boilers will often come under "gas work" as they are based on calculations and not guessed at. The sizing of vent holes and vent positioning is also defined. Out of interest what is the exact boiler model and approximate size of this storeroom?

You've got the heating equivalent of the internet with so many routes the water can flow. Just rip it all out and lash it back up to get a basic system running. What boiler model?

You can't fit just the TRV head to the old valve...

Remember that many wet belt engines also utilise a wet belt for their oil pump drive..this can also fail and is not always changed. The Puretec engines used on many Stellantis group cars now have a chain conversion kit that hopefully solves the problems for the remaining cars life...although...

It looks like you knocked the crap out the nut too. New trackrod ends and nylocs required for you and other road users safety. With the correct tools & technique there's no need for that damage.

Hemp was banned decades ago on potable water connections. Try Loctite 55 string instead of tape.

Sure if you go mad it will blow the opposite face off the brick as the bit breaks through but so will a traditional impact/percussion drill. You've got variable speed and you can always pilot hole drill first with less risk of breakout. Once you've used SDS you will never waste anymore time with...

Get the PBH... Apply a little grease to the SDS bit (chuck end!) and let the drill do the work...you don't need to apply loads of pressure.

PTFE tape wound as a taper on the male threads or Loctite 55

Get a compression elbow and a bit of pipe and rejig the valve so it points down. Then feed the hose up through the base of the unit so it's not strained. Deburr the hole through the unit base.

Post pics of pipework and anything related..

Any open discharge pipes eg. an unvented cylinder

Are you terraced/semi ? I got called to a major leak at a terraced house and it was so bad it ran through the party wall...the neighbours had also called out a plumber thinking they had a leak.

In the past certain manufacturers eg. Ariston were sold through builders merchants and being cheaper than many other makes were frequently installed by non registered gas installers. Certainly in London most installs were rough. They're a nice boiler to work on with very few design faults unlike...

Typically 0.8 Bar for a standard install ie. boiler not in the basement and several floors above (that would preclude a higher pressure)). Check pressure with zero pressure on the water side of the vessel. Be amazed if that vessel's still ok....but they were tough boilers given most were illegal...

Flexible cables

Leaky alkalines

I suggest you check whether you can get your buildings & contents insurance to cover it....anything apart from a purely admin role and it's almost impossible to find a suitable policy. There have been many articles published over the last few years looking into this hurdle, estimating that...

Turn the boiler power off at the wall. A common leak is the LHS plastic manifold pin holing. The 2nd pipe (15mm) along from the RHS...follow it up into the boiler and turn the isolating valve 90 degrees. Hopefully that will stop it. Don't use the hot taps.