Mick, If you want to be clinical, measure the length of a radius arm shaft, then calculate what it should be using trig.

Also worth checking your toe in to ensure it's equal both sides and is about 3mm total. If you can't get any shims in front of the bracket to adjust this, file the hole forward a bit, as well as upwards for camber. I had to do this one side on my red car- it had had a shunt sometime previously in the past 20 odd years..
You still see lots of `crabby' Minis.. kazjim has one...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

tenks....just a litlle wary of making a change without letting the rear end "settle" to see where you really are.... which brings us to front and rear subframe alignment.....

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"Show me the Mini!"

A bloke I know used to race minis and had a wheel alignment shop. He used to drill out the outer hole and then put a big thick washer behind the nut. when he got the alignment right he would weld the washer to the frame. If he needed to adjust it he would grind off the washer and weld on a new one!

Yeah I did that in 1968, on my first 850!
But if you know what it needs, filing and welding makes a neater job, IMO.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.