Agree with most of that,though Agas can run rads but they need a separate pump system and replumbing,and it aint worth the hassle.I hate buying new stuff,and it's completely unnecessary with a Rayburn as there are tons of 2nd hand ones.Best get an oil one and convert to run on multi fuel ( bits available on Ebay.).If you have a flash kitchen,still get a used one, and have it re enamelled etc. as the new ones are crap....so flimsy they actually come flat packed and are built on site.You often see decent 2nd hand ones round here for 2-500 quid,but the cheapest are always that sort of poxy sunburst colour,avoid, unless it's free or you're visually handicapped. Incidently, rayburns will run more than 6 rads,but they need a small cheap electric pump in the system.(easy).
Best system for me was (in a 4 bed house with 3 receps) aforesaid Rayburn in the kitchen with 5 or 6 rads,and a decent woodburning stove in the living room.Best for me was a Morso(squirrel,for smallish room,will run one rad with a backboiler,Or better still a Dove,a few rads) They can be got second hand but you need to be lucky,you'll pay about 3-500 quid,if they're decent,for the big one,but you might get lucky,I got one for £100! Most second hand ones wont have a back boiler you can buy them new for circa 200,then drill the back of the stove.....be courageous! The wood burner for the living room is best run on a separate system ,and a little header tank. If you can wangle it so that the adults bedroom is above the living room that's brill cos its easy to connect that room to it,and the header tank can go above it in the loft.(Kids rooms ,bathroom warm all day with rayburn,light the woodburner in the afternoon and main bedroom will be warm when your partner goes to bed,leaving you drunk and unconscious on the sofa.
If your still with me,beware the rayburn wont get meltdown hot just on wood,but it aint bad,ash is great ,and I hear there maybe a bit of that about in the foreseeable future.Also chuck a bit of Anthracite/coal on last thing to ensure it stays in,unless you're an insomniac like me.
Thats it!.......bit nostalgic for me,Iv'e just moved into a house with Mains gas...........BWs.