Any plumbers on here covering London W2?

[DevsAd]

To add a couple of pumps to a flat to boost mains and gravity flows.

Or, ideally, to go for a fully pressurised system involving a Challis CB+240 or S-T Flomate MBF 300 supplying a new unvented cylinder.

Access to space is good for both solutions (dedicated timber 'shed' with mains power on roof to hold these items), tho' some floorboard lifting and pipe running obviously required.

Thanks.