Many of the later cassette splined tools will fit many of the old freewheel sprockets and vice versa in case you haven't tried or didn't know. But under £5 posted for a freewheel specific job http://www.ebay.co.uk/itm/SHIMANO-FREEWHEEL-TOOL-/230847017045?pt=UK_Spots_Leisure_Cycling_Tools_RepairKits&hash=item35bf8df055
@Mr_Bump started
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Many of the later cassette splined tools will fit many of the old freewheel sprockets and vice versa in case you haven't tried or didn't know.
But under £5 posted for a freewheel specific job
http://www.ebay.co.uk/itm/SHIMANO-FREEWHEEL-TOOL-/230847017045?pt=UK_Spots_Leisure_Cycling_Tools_RepairKits&hash=item35bf8df055