Regarding the seats -
A320's
Non of the A320's have been fitted with the new "tablet holder" seats, G-OZBW/X/Y have seats covered in purple leather style material, these seats are ex previous carriers that have been re-trimmed.
A321's
Aircraft G-MARA, G-OJEG, G-OZBI/T/U/Z, G-ZBAF/G/K/L all have the new seats fitted.