Most people would think off peak after 09:30.....
In reality it appears quite rare for 0930 to be the starting point for 'Off Peak' fares.
In an idle moment I looked at various destinations from Bristol Temple Meads and checked the Off Peak Return (SVR) and Off Peak Day Return (
CDR▸ ) ticket validities for the outward journey.
Bristol
TM‡ - Swansea (SVR) Anytime
Bristol TM - Grateley (SVR) Anytime
Bristol TM - Lancaster (SVR) depart after 0415
Bristol TM - Edinburgh (not London) (SVR) 0500
Bristol TM - Weymouth (route Yeovil PM) (CDR) 0700
Bristol TM - Preston (SVR) 0754
Bristol TM - Salisbury (SVR) 0810
Bristol TM - Yeovil PM (CDR) 0815
Bristol TM - Oxford (SVR) 0815
Bristol TM - Gloucester (CDR) 0830
Bristol TM - Exeter SD (SVR) 0833
Bristol TM - Birmingham Stns (SVR) 0930
Bristol TM - Weston SM (CDR) 0930
Bristol TM - London Paddington (Super Off Peak Return) 0945
Bristol TM - London Waterloo (route Salisbury) (CDR)
arrive after 1000
Bristol TM - Peterborough (via London) (SVR)
arrive at Paddington after 1005
Bristol TM - Ipswich (via London) (SVR)
arrive at Paddington after 1010
....and not to forget that anything to Reading, to or through London will also be subject to evening restrictions on the return journey.
Some nice anomalies there (no surprise!). You can travel to Salisbury on a SVR after 0810, but buy your ticket to Grateley (the next station) for a couple of quid more and you can leave Bristol on the 0544. Going to Preston you can leave on the 0800 change at Brum with a SVR, but going next stop Lancaster you can leave on the 0627 change at Brum.