Paul Kelly
Verified Rep - BR Fares
it's an issue ATW have when they put the symbol for 'Seat Reservations Recommended' above Manchester to South Wales services - it doesn't mean everyone who plans to travel on that service needs to reserve a seat or risk standing, just passengers on certain sections of the service.
There's no technical reason why they can't specify in a train schedule that "reservations recommended" applies to only part of the journey though, e.g. CrossCountry do this with their daily train from Aberdeen to Penzance, which is "reservations recommended" (shown here as a solid black diamond instead of the normal hollow diamond) only as far as Edinburgh.