Depends on what cable you plan to run up to the loft. If flex, then a flex outlet plate would be my suggestion, but most of those are bottom entry.
If you are using trunking then don’t use a patress box, use the existing back box and fit a cooker outlet plate mounted upside down.
The trunking will probably butt up to the plate.
Something like this maybe
If you are using trunking then don’t use a patress box, use the existing back box and fit a cooker outlet plate mounted upside down.
The trunking will probably butt up to the plate.
Something like this maybe