This is from memory, so amendments welcome.
Woking reliefs cover Woking ASC (G8), Guildford ASC (G7), Wokingham [IIRC] (G5) and some/all of the Pompey Direct boxes (definitely Farncombe, not 100% on the other two - all G3). G8 + 24%. Most recently advertised in July, as a six-month secondment with the "possibility" of becoming permanent.
Salisbury reliefs mainly work Salisbury (G6) and the three panels at Basingstoke ASC (1 x G7, 2 x G5). Also sign Brockenhurst (G4/5), Yeovil Pen Mill (G?), Marchwood (G2/3) and a crossing I can't recall. G7 + 32%. Last advertised in summer 2016.
Interesting areas and both pretty chingy, so minimal turnover of staff.
Only downside - for some - is that all the above are 8h rosters.