I'm pretty sure that the answer is no outside UK CAS, and most certainly no in UK CAS, you'd simply be causing so many problems you wouldn't be worth dealing with.
Unless you've already filed a flight plan which entails you flying IFR then VFR, to refile IFR after changing from IFR to VFR requires you to cancel the original plan and refile your flight plan enroute.
A considerable inconvenience to enroute agencies and a very high workload for you.