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@MikeTinsley
Just in case anyone else gets here to solve the same issue - I solved it yesterday with some ease in the end!
Bought a decent quality 6 inch nail, filed off the sharp point to give a surface to hammer, carefully filed down the diameter of the head until it just fitted through the axle hole in the bearing then dropped my home made tool (the nail!) through the bearing narrow end first (the head won't fit through the bore of the hub in the middle).
Then turned the wheel over and angled the nail so that the head was now pressing against the inner face of the bearing and gave it a few taps with a hammer. Then started rotating the nail round (still at an angle) and tapping it - repeated until the bearing dropped out (need to rotate the nail tool so that bearing gets pressed out all round, otherwise you might jam it in catastrophically at an angle...).
Hope that makes sense if anyone reads this!
Cost me 10p for my home made bearing drift tool and took 20 minutes to make it and get both bearings out - great result and tons of self satisfied feelings!