GL1 postcodes GL10 postcodes GL11 postcodes GL12 postcodes GL13 postcodes GL14 postcodes GL15 postcodes GL16 postcodes GL17 postcodes GL18 postcodes GL19 postcodes GL2 postcodes GL20 postcodes GL3 postcodes GL4 postcodes GL5 postcodes GL50 postcodes GL51 postcodes GL52 postcodes GL53 postcodes GL54 postcodes GL55 postcodes GL56 postcodes GL6 postcodes GL7 postcodes GL8 postcodes GL9 postcodes