Check out the map below for some inspiration. The data on this map comes from BirdTrack and shows where bird records have come from in the last ten years (Jan 2007-Oct 2017). The darker the square the more records have been gathered from that square. All the pale grey squares have no records in BirdTrack since 2007!
Why not pick a square and do a complete list of the birds you see or hear in it, then add those records to BirdTrack? We will endeavor to update this map periodically so you should see the squares turn darker as records are added.
Don’t forget BirdTrack has a brilliant smartphone app which makes adding records really easy. Take a look here: https://www.bto.org/volunteer-surveys/birdtrack/taking-part/birdtrack-apps