There's also the small issue of using a potentially unmonitored aid. ILS, to the best of my knowledge (limited to UK) is not generally monitored by ACCs and if there's no ATCO in the VCR watching the indications, I don't think I'd be too happy about using it.
The monitoring requirements are in CAP670 for the UK, and ICAO Annex 10 give the minimum international requirements - don't have time to browse them at the moment. I haven't found the ICAO annexes on the internet yet. I'm pretty sure you have to buy them.
ST