Booby problem!

I've just collected my wedding dress (which will be sitting at home until the final fitting in May). I get married in June. Since I hate strapless bras, I bought some sew in bra pads from a haberdashers. I've just held a pad against me, and it doesn't fit! I am between AA and A cup, the pad is one size fits all and seems to be around B/C cup. I've seen similar pads on US websites in A,B and C cup sizes. Does anyone know where these can be bought in the UK?