It is back for next summer. It is being sold as a 737-800 on the website and will be rotated on 737-800 routes at MAN. The logic behind this is to have a 757 spare at all times as last year the A320 could not cover the 757 as a standby due to the capacity difference.
LBA will have a 737-300 standby for the majority of the week (some peak times will see all aircraft in operation), the same goes for MAN with the 757.
Fingers crossed this will mean OTP is dramatically increased compared to last year. It took a lot, but the big boss has finally been convinced to splash out on standby aircraft.