Yes, this is its second winter. Old one had done 32 years. Job was close on 6500 but that included a couple of new rads, all new water tank, pump, control valves, trvs and contollers/thermostat. Plus, while it was drained down had a few gate valves replaced with quarter turn balls, new tank ball valves as well. 5 bed house. Went for a grant blueflame, about 300 more at the size we needed but supposedly more efficient.
Part of the thinking was I am "getting on" so wanted to have everything as reliable as possible, I doubt I will be wanting to change valves etc. In a year or few. Also, planning to live here for a long time so see it as an investment not just a revenue cost.
I thought carefully about ashp but house not really efficient enough and would probably needed a piggyback oil boiler anyway. Reckon it saved me 200l of oil in first year, but can't really compare because it wasn't that harsh a winter.
I am very keen on using local firms who employ their own staff so got a couple of local quotes. There was a minor problem a few weeks later, rang and they said sure, I'll get him to call on his way back this afternoon. All done, no charge, no arguments, you wouldn't get that from a call centre.
Not able to advise, except to say think it all through, what do you want - just a boiler or more besides. Your job won't be the same as mine so what I paid isn't that relevant, but the actual labour cost for just a boiler is probably similar no matter how big the boiler is.