Smithers,
As a QSP and as long as the last military IR you held was Green then the cost should be around the £12,500 mark. This info is from last year so it may have changed but included the AS355 hire for training and test.
Lightning_boy has a point about the cost, however doing your training in the country you intend to fly in cannot be under estimated when your meeting and working with others who already have a job and may be able to advise you on who is recruiting and more importantly people are then meeting you as a potential employee, rather than receiving just another CV.
I do partly agree with MD900 in that if your a low time pilot then an IR may not help you that much to get a job but if you have 1000hrs turbine then that IR may make the difference when applying for a job, depending on the sector of the industry you want to get into.
MS