For the pre-ATO phase, if done privately with an IRI you can expect to pay in the region of £40-50 h/r.
The ATO phase in my case with Stapleford Flight Centre was £130 h/r
The above is based on my experiences of having held a IMC(R) aka IRR and flying in an aircraft with experience. These costs above are likely to vary depending on the circumstances of the instructor, school and pilot. Read more