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Sorry wasn't being sarcastic. Been out to plumbers supplier who sold me a Honeywell trv which was supposed to have correct fitting. Except that it dont it's still has union style. New pipe it will have to be the

Because the rad came with the trv and has a 'normal' 15mm union connection. Whereas the old trv has a larger inch fitting. I did say at start that old kit is 30 years old. !

Hi I have a new radiator to replace a 30 year old one. I'm organised to change the trv bur the old one on the pipe is a Honeywell(boss) type with a male screw thread which fits on pipe first and then screws into a female in the main body of the trv. Similar to current partnumber49341059 (boss)...