Well, the rover IS valid on LM▸ within the mapped validity area, but quite why FGW▸ are including the LM 0849 Hereford to Birmingham on the list of valid trains mentioned on their website is beyond me. Neither Hereford or Birmingham are on the published map. You can legitimately catch the 0849 ex-Hereford from Great Malvern (0918) to Worcester SH on a FOSS▸ or FOSW▸ , but for FGW to suggest those Rovers are valid from Hereford to Birmingham is plain wrong.
The FGW website doesn't actually state that.
As copied from the FGW website:
0556 Exeter St Davids to Barnstaple
0640 Exeter St Davids to Axminster to Salisbury (train continues to London Waterloo)
0654 Exeter St Davids to Barnstaple
0724 Exeter St Davids to Axminster to Salisbury (train continues to London Waterloo)
0819 Plymouth to Penzance
0826 Exeter St Davids to Axminster to Salisbury (train continues to London Waterloo)
0827 Swindon to Penzance
0836 Taunton to Bristol Parkway
0840 Patchway to Taunton
0843 Barnstaple to Exeter to Exmouth
0849 Hereford to Worcester Foregate Street (train continues to Birmingham New Street)
0850 Weymouth to Gloucester
0854 Swindon to Cheltenham Spa
0858 Great Malvern to Worcester Shrub Hill (train continues to Birmingham New Street)