Just wondering if its possible to remove the rocker shaft and rockers by slackening off the adjusters fully so that the shaft can be slid out
Or is it a matter of undoing the head stud nuts to remove the posts

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1970 MK2 Cooper S

It is possible, but much easier to work on with the whole thing removed.
If you remove it when cold with the 5 front head nuts left tight, generally it won't disturb the head gasket.
Just tighten the 4 rear nuts (inners first) to 40 ft/lb when refitting, then re-check the torque on the lot.

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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.