quid and df1....in the UK a VISUAL approach means that ATC are still responsible for the separation...therefore your IFR plan will not be cancelled.If however you request an approach maintaining VMC....THEN you are responsible for your own separation.
Hover Auto ...it is not unreasonable for a controller to ask if crew have the airfield in sight.I myself will check that the aircraft is VISUAL FOR THE CORRECT AIRFIELD!!(it happens)and we have a procedure to report RUNWAY LIGHTS in sight to ensure that we are all singing from the same hymn sheet as it were.I will also check that they are visual with any high ground and masts.Hope this helps