About a month ago I paid USD $2,500 including shipping for a 1-year old Akra slip, which is the equivalent to GBP 1580. I think tightie just sold his for about the same price. Cheers.
Daily: 2013 e92 M3 MW FR DCT ZCP / ESS VT2 650 S/C, MRF mid/Akra slip, ST BBK
Track/Airstrip: 2011 997.2 Turbo S PDK / 501 AWHP & 536 AWTQ Bone stock on a Mustang dyno
Beater: 2013 X5 3.5sport