Boots, Wilkinsons, Sainsburys all sell them... IIRC, Wilko's and sainso's are the cheapest...
A watch maker/repairer will sell high capacity ones too, but be prepared to pay about 3 times as much (£6 each?!) for those. Don't bother.
@Mc_Nebula started
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Boots, Wilkinsons, Sainsburys all sell them... IIRC, Wilko's and sainso's are the cheapest...
A watch maker/repairer will sell high capacity ones too, but be prepared to pay about 3 times as much (£6 each?!) for those. Don't bother.