I would be interested in the routes from Scotland and Southampton/Portsmouth.
The 596 will become a historical route soon. The 596 starts in Edinburgh and runs to London via Glasgow.
From Southampton there's the 725, with a daily summer short to Exeter (Friday to Monday in winter) and a daily Brighton to Penzance service.
A daily 549 to Inverness (starts Bournemouth).
3x 830, from Portsmouth to Liverpool twice daily, with one starting from Poole and extending to Southport.
3x 626, from Swansea, via Bristol Bristol, continuing to Portsmouth.
A Friday overnight service 334 from Preston and Manchester to Poole, returning the next day (high Summer only).
A Friday overnight 324 from Bradford and Leeds to Poole, returning the next day (high Summer only)
9x720 a day to London via Heathrow with one extending from/to Bournemouth.
2x310 a day, both via Oxford and Leicester, one starting at Weymouth and continuing to Bradford, the other going to Lincoln.
2x025 starting at Bournemouth to Brighton and Gatwick, with one extending to Ramsgate and Westwood.