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try removing the trv head and putting a 5 pence piece in under it. then screw it down as far as it will go.

why is it twaddle? old toilets used 9 or 10 litres to flush.All modern use 4 or 6 litre twin flush. so no, not much difference. how clear is your soilpipe and drains? more likely to cause problems there.

try bleeding downstairs rads. if you can bleed hot through but the rad doesn't stay hot, I'd say the pump's had it. not too bad.

yep, screwfix jobbie. may be cheaper to replace whole unit.

yes you can get the whole valve- something like toolstation 45273 but why does it keep filling with air? have you tried lighting the gas?

why would the rads be leaking? he have them off to tile the wall? if not, call his bluff and get him back.

tapping noise is thermal pipe expansion underneath the floor- pipe rubbing on joist. waste for shower and basin needs investigating. second floor? may be a lot easier to remove part of ceiling below.

by all means use vaseline.

every pair of drops have to be drained individually- if that's what you're after.

could try a bit of descaler, if the heads are on the sides then try packing with descaler soaked cloth. give it half an hour and try again.

probably a good idea to get the system balanced properly as well as a flush out.

wouldn't worry about the offset, as long as it seals.

primitive and easy to service, have you cleaned the heat exchanger? last one I looked at was heavily silted.

installation/ fault finding instructions on the net, and no electric to boiler, only external pump and controls.

thought the 2t didn't have mains connection? just water, gas and piezo ignition.

need a professional freezer to even attempt to freeze cold mains....go and buy a stopcock key and turn it off in the street.

silicone it to the floor.

probably give you an extra 500watts, thought about putting another rad somewhere else in the room?

is the pipe visible? if not really, and just a waste pipe, could try a wrap of denso.

looks like a cheapo one from wickes/b&q. supposed to screw down but the base with the thread is snapped off. buy a new flushing unit as suggested. this one's knackered.