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If as you say burner fan is running but no ignition photocell is normal suspect. Not high limit stat they have to be manually reset. Depending on age of your boiler riello did have a problem with photocells we changed quite a few..

Loctite 55 is brilliant stuff for me way better than ptfe.

Saw him a couple of times with Booker T Jones .Outstanding guitarist on some lists only second to Hendrix.

Air duct end of burner push fan gently blades easily bent .

I've a customer few villages away who has a Quooker but due to our wonderful hard water she was having it serviced 3 times a year at £230 + vat a go. We have fitted a purpose made filter to it now slowed servicing to once a year.

With power switched off see if fan blades actually move.

Magnet sticking to pipework = crud than needs to be removed. The valve appears to be a bypass don't touch it will leak for fun.

What complete and utter rubbish! As has been said it's a spring loaded safety valve ! I'm old enough to have installed many. No longer fit them, needs removing and a brass or iron plug in its place. I'd just get some old towels and do it live.

I've done and taught most types of welding (ex pipeline welder) It really depends on what you intend doing. Stick together a few bits of mild steel mig would do it, though Stick welding (M M A) is still worth considering. Add aluminium or stainless tig would be way to go you can also braze...

Yep loose the rubber seal, loctite 55 wound on so there is plenty up to shoulder on tee Wind in job done.

Assuming you mean the joint from the tee into towel warmer? Loctite 55 is what we use never had a screwed fitting leak with 55 you can even 'back' it if needed.

I would suggest the clue is in the name 20/30 maybe KW? Your really need to do proper heat loss calculations to determine required size of your new boiler. Don't buy a oil boiler that starts with a W !

From memory your time switch is on a common backplate. So anything that uses that should fit straight on. We tend to use EPH stuff good price very reliable and 5 year warranty.

As above if you're going to with a heat pump just go for it. You can easily re jet the burner down to 15kw from memory it's a .45/80°EH nozzle needed 8 bar pump pressure you may need a disk on air intake. We have got a couple of the small Grant's running on .40/80°EH nozzles on small systems.

We take him old one to copy but also take careful measurements of where it fits .

That's exactly what we do have a local metal basher make them up.

As valve was changed by BG less than a month ago maybe get them back?

Your pipework won't be 25mm it's either 28mm or more likely 22mm.

From memory they are intended for solid fuel only. Maybe try contacting Harworth Heating they have made conversations even new heat exchanges for rayburn cooker range. harworthheating.co.uk