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[Andy B]

....

M14 x 1.25mm then   .....

that's the same as a regular Omega & Astra sump plug then .... I think. I 've a spare Omega plug,  an almost stripped Astra sump pan but no suitable tap to clear the Astra sump. I'm sure I decided the plug was M14 x 1.25     I'll dig my thread gauges out tomorrow. 

Pretty sure they are 1.5.....the 1.25 is a little odd....hence why french cars use it

I'll measure my spare sump plug - now that I've found my thread gauges  . I know thw standard M14 tap I found in my big tub of taps wasn't the same thread ........ thinking about it  it might have been the same pitch as an M8 bolt ie 1.5 pitch 

[ChevetteNick]

it might have been the same pitch as an M8 bolt ie 1.5 pitch 

Normal M8's are 1.25 pitch

[Andy B]

it might have been the same pitch as an M8 bolt ie 1.5 pitch 

Normal M8's are 1.25 pitch

You are of course quite correct .... M8 tapping 6.8 17/64"  M10 has a 1.5 pitch 

[Psychoca]

I use ptfe around the sump plug and gasket sealent at the plug head too...

Not the ideal solution, but, cheap and works...  I just take great care to get the plug tight, but not so tight as to strip the thread any further...

When I have a little more cash, I may well helicoil it, but, for the time being, it can wait....