I have managed to get all the nuts off without breaking the chrome inserts using the same WD40 method
The problem is now that the outside of the wheel studs are corroded in the lugs.
The centre ones seem to have a bigger hole and I managed to free them using a mix of WD40, degreaser and thin oil but the outside ones are solid and it does not seem possible to get any release agents into the hole!!!
I am sure they will break if I hit them any harder than I have already