why would he need to change the valve just take the tails out and put them into extensions New rad from wickes is 30 quid and they are stelrad clones why fek about for 36 quid including extensions .Would need to change the valves too. Haven't seen any old brass union extension tails for those old wheel valves, seen the newer ones that use seals but they don't seem to fit those old valves too well and I've tried a few.
I'd whip it off, wire brush it, scotch pad it and paint it and see how it goes.
20MM EXTENSION TAIL FOR STD RAD TAPPINGS | Wolseley
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