Does GU1 flood?

GU1 1LH up to High GU1 1LW up to High GU1 1QA up to High GU1 1QE up to High GU1 3UX up to High GU1 3XJ up to High GU1 3XL up to High GU1 3XQ up to High GU1 4BZ up to High GU1 4EH up to High GU1 4QL up to High GU1 4QT up to High GU1 4QU up to High GU1 4QX up to High GU1 4QZ up to High GU1 4RP up to High GU1 4RY up to High GU1 4SB up to High GU1 4SJ up to High GU1 4SZ up to High GU1 4TX up to High GU1 4TZ up to High GU1 4UB up to High GU1 4UF up to High GU1 4UG up to High GU1 4UH up to High GU1 4UL up to High GU1 4UQ up to High GU1 4UW up to High GU1 1AJ up to Medium GU1 1BA up to Medium GU1 1BU up to Medium GU1 1BZ up to Medium GU1 1DA up to Medium GU1 1DB up to Medium GU1 1DL up to Medium GU1 1DP up to Medium GU1 1ED up to Medium GU1 1EF up to Medium GU1 1EL up to Medium GU1 1FD up to Medium GU1 1LD up to Medium GU1 3BR up to Medium GU1 3BT up to Medium GU1 3DY up to Medium GU1 3EG up to Medium GU1 3EL up to Medium GU1 3TZ up to Medium GU1 4QW up to Medium GU1 4RW up to Medium GU1 4SG up to Medium GU1 4SQ up to Medium GU1 4SS up to Medium GU1 4TL up to Medium GU1 4TY up to Medium GU1 4UU up to Medium GU1 4UX up to Medium GU1 1AA up to Low GU1 1AG up to Low GU1 1BT up to Low GU1 1DN up to Low GU1 1DT up to Low GU1 1DW up to Low GU1 1DX up to Low GU1 1EA up to Low GU1 1EE up to Low GU1 1EH up to Low GU1 1EW up to Low GU1 1FL up to Low GU1 1FP up to Low GU1 1HN up to Low GU1 1HR up to Low GU1 1HS up to Low GU1 1HX up to Low GU1 1HY up to Low GU1 1JD up to Low GU1 1LA up to Low GU1 1LL up to Low GU1 1LN up to Low GU1 1LQ up to Low GU1 3AU up to Low GU1 3UT up to Low GU1 3UY up to Low GU1 3YA up to Low GU1 4PS up to Low GU1 4PX up to Low GU1 4PZ up to Low GU1 4QS up to Low GU1 4SN up to Low GU1 4ST up to Low GU1 4SW up to Low GU1 4SY up to Low GU1 4TT up to Low GU1 4XB up to Low GU1 4YL up to Low GU1 4YN up to Low GU1 4YR up to Low GU1 4YT up to Low GU1 4YW up to Low