Hi Ozzydo,
3 Days before online check in opens, some seats which look occupied are unblocked and available for selection.
On the LGW to PFO flight the best seats (IMO) are in row 12. This is the second row of exit seats. The seats in front in row 11 are also exit row but do not recline. Row 12 even has more legroom than the seats in CE except row 1, although in CE the middle seat is kept empty...