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I have read a fair bit since my previous post and to be fair there seem to be powerful combi these days that have integrated tank and can deliver 25l per minutes. That seems to be sufficient for a 2 bathrooms/15 radiators house. We will have 3 bathroos but one will be in the utility room and will most likely never be used at the same time as the others.
I see these builders point though. Megaflo needs more than 1 bar to work as intended but thames water is only required to deliver 0.75 bar or something. So if water pressure ever drop to that the megaflo becomes irrelevant. This is what happened to his dad a couple of years ago apparently, water pressure in his area dropped from 6bars to less than 1 making the megaflo a huge unecessary expense.
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Aldersbrook
Looking around the internet it says that unvented systems need to be installed by a G3 engineer. That sounds impressive but it just a one day £90 course than any tradesman could easily do, it seems your guy hasn't bothered to learn. I installed my own system about 11 years ago and the building inspector wasn't bothered about it then. The annual maintenance check is very simple.