Errr ... it was only 1p before the 'crash' to 0.63p yesterday. It had a solid support at 1.25p from September 2002, yet this was broken on 24 March, so once support has gone there's nothing to hold it back from the cliff edge.
Yesterday's volume was 64.1m according to ShareScope, representing around £640,000 - so perhaps it was someone crystallising their losses before the end of the tax year.
Hope you didn't lose too much.