Got them out !
For anyone with the same deck its not quite as it suggests in the diagram.The bearings are in a tube welded into the deck that has a step in the bore top and bottom to prevent the bearings going in too far.Remove the pulley, give the top of the shaft a good tap (I used big copper hammer) and the shaft comes out through the bottom leaving top bearing in the tube.Press bottom bearing off shaft,then flip deck over and just knock out the top bearing ( I used a length of steel pipe).Luckily whoever was in there last copper greased the tube to death so they didn't put up much of a fight.
As Mr Haynes used to say "refitting will be a reversal of the removal process", Press bottom bearing onto shaft, press into tube until bearing hits the step in the bore and then press in top bearing,job done. Bearings are 6205RS 52mm x 25mm x15mm.