Anyone know the size of a blade plug?

I only have deep imperial sockets and don't really want to buy a whole set of metric just to take the plugs out!

I am guessing 17mm but confirmation/truth would be much appreciated.

Pretty certain you want a 10mm plug socket and an extension for the ratchet or whatever as the plugs sit pretty low down, one of those dedicated plug spanners will not reach the plugs (as i found out!)

Yep its the 10mm (smaller of the two) plug spanners (thats 10mm plug thread diameter not 10mm socket size obviously ).
A proper plug socket with rubber grip inside makes it a lot easier to get them in/out as they are quite deep inside the head.

Chris