Just looking around...
http://www.worldofhealthandleisure.c...ccessories.htm
RUBBER MATTING
JM10 Solid Rubber Mat, 2 m x 1m x 10mm 46.95 39.95
JM2 Solid Rubber Mat, 2m x 1m x 17mm 82.19 69.95
This stuff looks thick enough..
http://cgi.ebay.co.uk/STRONGman-weig...QQcmdZViewItem