As per here,

http://www.fullfatrr.com/forum/topic13980....rade+wiggs

I don't have any left in stock at the moment but could possibly source one in a few weeks time but if you dont want to wait and they are still £175 from LR then maybe go for the new route  FFRR MY06 facelift With TDV8 Alloys Zeros/ATR's
Mantec Sump Guard, Rigid Load liner, MY10 BT upgrade.

All joking aside, have you turned the volume up on the phone itself when connected to the bluetooth?

A lot of phones now have seperate volume settings for music, films, calls, bluetooth, headphones etc. The in-car volume my BMW goes up and down if I adjust the volume on the phone itself.

It caught me out a few times thinking the car stereo was at fault, when really my phone had its own volume turned down. V8 or else ...