F/L Noel Russell DFC of 235 Squadron shot down two Bf 109s (G14s apparently, though it's not my area of strength, so I can't cross-check effectively) during a single daylight action by Mosquitos of RAF Coastal Command against JG 5 off Norway.
There is also a report that F/O K.V. Panter of the Fighter Experimental Flight shot down three 109s during a Ranger sortie to Landau airfield, but I've not been able to confirm this - I've encountered on a number of occasions claims for Bf 109s in daylight which later turned out to be training aircraft.
