Non standard replacement trv head?

14 Aug 2018
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United Kingdom
I'm in the process of trying to find a replacement trv head for a radiator in a flat which is part of a district heating scheme. All the other radiators are connected by 15mm pipe and are m30 fittings, but this one is on 22mm pipe and an m30 fitting is too small. I can't be the only person to have had difficulty finding a replacement, as all the other trvs have been replaced at some point, except this one and it no longer shuts off completely. I have tried various heads from Screwfix ( Drayton and Pegler) but they were too small. Does anyone know where I might find a larger size or an adaptor? Thanks
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