A Beechgrove composter web search came up with some iffy results: could you, [member=1964]xillent[/member], provide a link to whatever site or ad' or vid' you came across please.
In meantime, I have 6x 330 ltr Green Johannas which are advertised as hot composters: I'm not entirely convinced they really can be counted as hot composters though.
Retail price £120 ea right now at 'Get Composting' and at 'Great Green Systems'. HOWEVER, all 6 of mine were purchased at a Cornwall Council subsidised price via 'Get Composting'; my most recent pair cost me a total of just £64 inc delivery and I seem to think 'GC' and 'CC' still have an arrangement. Other Councils and suppliers might have other subsidising arrangements.
I stick pretty much every bit of waste from kitchen (which is not a lot of waste actually) inc' the odd bit of meat-based products, but latter is rare. I don't put bones in although that is deemed to be OK. Otherwise, extras are toilet roll tubes, shredded or torn paper, grass cuttings, "soft" hedge cuttings and anything that has gone through the garden shredder.
Personally I reckon the GJs dry out fairly easily, even with vents at minimum setting, so need to be frequently monitored for moisture.
I've dedicated one to humanure production as a trial (after a work-party weekend) using compostable bagged toilet waste. I add the odd new topping (e.g. grass cuttings) now and again and it seems to be "composting down" well enough even over the Winter. (Another 6 months at least though before I start sampling the results!)