Jmmoric, the problem is that so many flight crew don't understand their responsibilities in class G airspace, let alone if you add the UK FIS into the mix. Too many pilots fly their aircraft as "good weather" or "bad weather" rather than VFR or IFR and I've heard ATCOs use IMC and IFR as interchangeable terms.
Under ICAO FIS, in uncontrolled airspace, if you have surveillance and the flight is identified, regardless of whether the flight is VFR or IFR, you provide traffic information and avoiding action if the pilot requests it or if you as an ATCO believe it necessary. If you want to provide ATC service, then you do so in controlled airspace but bear in mind that you provide FIS and alerting service alongside ATC service to controlled flights.
Change is coming. Give it a few months and we should here more.