It sounds like you would benefit from Liposuction, as Liposuction is not a weight loss procedure and actually achieves the best results when you are at your optimum weight. It will remove stubborn pockets of fat and can help clothes fit better which can lead to the appearance of weight loss.
The area you refer to will count as one area, and one area of Liposuction will approximately start from £2700, with every additional area costing £600.
To gain a more accurate price, book in for a free consultation.