Snapped my daggerboard on Gemini - Need Replacement

Was sailing my Starbard Gemini Tandem at the weekend and think i hit something in the water, because the daggerboard snapped in half!
It was a clean break so the knob and the pivot are ok, but need to replace the blade.
I'm based in the UK (south) and was wondering if anyone could offer some advice on obtaining a replacement. Not fussed if its second hand as the board is too.
Any help would be gratefully recieved.

Thanks.

Giles