my country of origin does not allow dual nationality, and the Home Office does not lie if asked
I have - or had - ILR since 1982. 31 years. Now I have a biometric "residence permit" and have to do the fingerprints etc on arrival, having been caught up in The Great UKBA Cock-Up of 2012.
Anyway, years ago, an Immigration official asked me why I didn't just get a UK passport.
I said, "Well, it costs time and money, police reports etc, I spend more than 180 days a year out of the country (which would have made me ineligible at the time), and my country doesn't allow dual-passports"
"Ah", he said, "But who would tell your country? We wouldn't - it's our business who we issue passports to"