As you are in Brum I would give either of the following a call.

Driver Transmissions,
Central Axle Services

Both of which are in Birmingham,

Or Geartech nr Kidderminster( My old mans firm)LOL.

All three of them are gearbox specialists and will be able to pull the bearing out for you withoput damaging anything else.

Looks like the mainshaft bearing on a MT75 transfer box.