It depends on the country. In the UK, IFR flight plans can be filed to and from airports without IFR approach aids. If anything, though, that's the exception rather than the rule around Europe. Try filing an IFR flight plan from Denham to, say, a German VFR airfield and your flight plan will be rejected with an error message. Eg:
PROF193: IFR OPERATIONS AT AERODROME EDFE ARE NOT PERMITTED [EDFE200A]