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Yes - but it's the 'condensing' bit that means the return temperature should be around 54 degrees. Whether that be a system, conventional, or combi condensing boiler. That is - it's not the fact that's it's not a combi that's key to what Bozza was saying. But, like him, I don't understand how...

All (modern) combi boilers are condensing boilers. I think?

Might be the cheapest - but it is then hardly, by definition, 'central heating' is it? I guess the proper question would be 'Is it cheaper to run central heating for just one radiator - or to have an electric powered oil-filled radiator (or similar)?'