It's actually quite a bit more costly than breast augmentation with implants, since the length of surgery is significantly longer - so it's the cost of the liposuction of the donor area, plus an additional cost of another 2.5-3 hours of OR time. The exact dollar amount will vary, depending on your location.
All the best,
This can vary tremendously by area or region. I am judging that you are from the UK and I am not as familar with the fees there. In this region, the costs for the procedure tend to vary from 4,500 up to 12,000 USD. In addition, repeated procedures may be necessary to achieve optimal results.