Been after these for a while and EBC have them back in stock, paid £170 with free delivery using the code 'RETURN10',
https://ebcbrakesdirect.com/ebc-racing-brake-pads-dp81539rpx
https://www.ebcbrakeshop.co.uk/ebc-racing-rpx-track-and-race-brake-pads-dp81539rpx_p32534076.htm
I will keep this...