"JWBH" wrote in message
...
We have small two storey terraced house in north London and the gas fired
central heating radiator started leaking in the first floor bedroom at the
tap. When it was opened up a bit the other day.

The nut on the top (not the two flat sided tap spindle) will not take a 13
mm spanner and the 14mm spanner slips around. Is there a special size
spanner I should buy, or do I have to go to town with the stilson?


Sounds like a job for a good old-fashioned 1/4" Whitworth spanner.

Steve