I did my training at Stapleford, with all ILS/NDB appraoches at Southend..... costs £14.50 (give or take a fee pence) per appraoch. I think in all I paid about £400 in appraoch fees over the course.
If you have a guy who just can't get the hang of ILS's then it's going to cost him a bit more but I would say £1000 sounds a bit OTT.