Cant get a ring spanner on it with the plug surely? I don't want to cut the wires in case I can't get it out or if it turns out it's not that at fault. Not that I have a spanner big enough here anyway lol.
Edit - I'm being a dick, I removed the lambda on the Rallye yesterday so Sam must have a big enough spanner.
I used the open end though as I'd only fitted it to the decat recently so knew it wouldn't be tight, does the ring end fit over the plug? 
Edit - I'm being a dick, I removed the lambda on the Rallye yesterday so Sam must have a big enough spanner.
I used the open end though as I'd only fitted it to the decat recently so knew it wouldn't be tight, does the ring end fit over the plug?