Advice required on which condensing combi to buy

[fred]

Simply because all DHW is currently from an electrically heated cylinder, ewwwwwwwww.

I know zilch (or rather less) about CH/DHW. Any experience/suggestions on a good unit?

3 sinks, most probably one at a time. Shower (often). Bath (rarely). Washing machine. Dishwasher.

CH radiators at a later date.

Possible cost of install (cavity wall)? Gas/hot/cold pipes close to hand.

Cheers.

[John Stumbles]

Boiler: Worcester Greenstar series or Vaillant reasonable quality at £700-800 with flue. Fitted around £2K ballpark.