First place to look is the Mfrs Instructions for the articular boiler - eg a Worcs Junior is allowed in Zone 2 as long as you don't have a clock or radio receiver for a stat on it. The thinking would I imagine be that that would lead to more touching.
Mfrs are fickle though, as are sparkies and their regs. "Cupboards" are undefined too!
There's a thread here where I asked - and was answered by a dose of "how dare you not know" before sanity prevailed. //www.diynot.com/forums/viewtopic.php?t=81494
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