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No, you call British Gas again and tell them that following yesterday's "repair" flow rates are well down and could they send someone round to sort it ASAP and obviously at their expence. They're the "experts" and they touched it last!

Note that Viessmann Direct are not the same as Viessmann UK. The latter are the manufacturers and can be contacted for warranty support and, if required, servicing. https://www.viessmann.co.uk/en/support.html

No, of course it should not vent into the cavity. Any fule kno that.

DFE so yes, 100cm2 free area required. I reckon the EDF monkey was not qualified on open-flue heaters, noted the visible staining on the rear bricks of the builders opening , decided "safety first", put the wind up the customer and f*cked off. An experienced RGI might well find otherwise. None...

Before lashing out 3k your neighbour could get an independant gas safety inspection and certificate from another engineer. The EDF bloke may have been overzealous in condemning the fire. He should, in any case, have left paperwork detailing his reasons for so doing.

Insulate the pipes if not already so and use plumbers band to hang from joists https://www.screwfix.com/p/ced-all-round-band-12mm-x-10m/18298

It would be informative to cut in a tee with a full-bore valve on the cold mains as it enters the boiler and one on the hot pipe leaving the boiler. Comparing the flow rates on each would help indicate if there's a restriction at the boiler, before or after. Could be something as simple as...

I would be suspecting blocked or undersized pipework, or a restriction somewhere e.g. a valve not fully open or a choked inlet filter. A more powerful boiler won't help.

And the flow rate at the kitchen hot tap?

Felt lagging is disconcertingly flammable and apt to smoulder; I'd suggest stripping back and dousing before letting rip with a naked flame.

kW and kWh are not the same!

This is a UK site. Try https://www.heatlink.com/contact

Ferkin heck -missed that!

Set the blue stat lower. Under no circumstances attempt to link out or bypass the safety overheat stat.

??? Video shows drip from the clear hose. Anyway it's from an faulty auto air release valve which requires cleaning or replacement.

^^ +1

heating pipework undersized or incorrectly connected to emitters +1 Unlikely to be boiler problem.

Can't help but think the answer is in the question..

Then Then, if you have a 3-port or two 2-port motorised valves, the system has probably been miswired.

You can imagine whatever you like.