Interesting
The CAA in table 5 section D (initial application) for an instrument rating PPL is priced at £121.00 plus the £6.00 for postage.
Ref:
http://www.caa.co.uk/docs/33/269PLSCorr.pdf
Or is the IMC a variation to a licence so £89.00?
Just applied for my IMC as well so I guess I'm about to find out what happens when you do fill the price in