I hop back on forth on this route often enough, and personally (respectfully of course) think you'd be a mug to pay £300 rtn (restricted business tickets start at around £145 one way) when economy is often around £55 rtn all in, with an ok cabin service (drinks, hot snack etc).
Anyone can use the self check-in (takes < 60 secs) and you can pick your seat from the map on the screen. Always operated by A321 or A319, flight takes less than 55 mins. Always a breeze, always a pleasure, even in economy.
*j*