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Sometimes if WD40 doesn't do the trick very hot water can help, especially if the cartridge itself is hard to remove.

What is the system pressure? It could just be a shortage of water.

Why do you need to cut it down?

You can always fit the pressure reducing valve after the mains comes in and then everything would be balanced. The relief valve will still need to discharge externally though.

My preference are Grant boilers... http://www.grantuk.com/products/oil-fired-condensing-boilers/ ... and no, I don't work for them.

I can't see any kind of auto bypass though on your S-plan

If they open and close as required I would try and live with it.

Loctite 55 every time.

If you did want to switch from oil to gas I would advise you do it once the oil boiler is at or near the end of its life.

If you think oil isn't that cheap you obviously haven't bought any gas lately...

No there isn't. What is supplying cold to the mixer tap? If it is mains then it won't work properly. If it is tank feed then do the same to both taps and the flow/pressure will be equal.

I don't think a decent plumber would A) leave that crappy plastic isolation valve in B) have any flexi coupler actually showing C) use two pan connectors on one pan like that. As the soil pipe goes through the floor a few inches away from the wall I think it is reasonable to have a small gap...

Ah yes sure it is... I didn't look at the photo very well did I?

You need to thread it and connect to it with a female iron to an MDPE threaded adapter or try a universal MDPE to Steel coupler. The outside of the steel pipe would need to be nice and clean though. Are you CERTAIN it is the water pipe? I would hate a GAS LEAK to spoil your bank holiday wknd!

"This video is private" is all I can see...

That cat litter would make an excellent bonfire fire-lighter afterwards. You can buy a "Cherry Bomb" Air Freshener that can mask the oil smell. TBH the oil will evaporate over a few days if you can put up with it. If not some news paper or cat litter but be careful what you do with it...

The passing could come from a very small flow from the cold into the hot I have seen it before.

The water is either coming in from the cylinder coil or a tap/shower that is passing cold water into the hot water system.

oops I thought that was the OP's drawing.

Do you have a second smaller water tank that feeds the heating system? If so and it is higher than the CWSC then the coil in your cylinder may be passing water [leaking] from heating system to hot water system... or... You have a mixer tap that could be passing cold mains water back into the...