See if this jogs any memories (from the bit I recall)
I am a Brixham seagul, I live down on the key, I fly so high, in the sky, there ain't no flies on me, I hang around the fishing boats and I ain't too well bred, cos I gobble up mackrel giblets, and I drops 'em on yer 'ead.
etc and definately to the tune of 'The Laughing Policeman'