I've been travelling into London from either Tring or Wendover twice weekly for the past couple months and have only had my ticket checked once on a LNWR service into Euston last week. No checks at all on Chiltern trains but the gates at Marylebone are usually always closed, Euston however often has the gates open and of course sometimes there's no gates at all.
edit: Might I add that the guard who checked my ticket on the LNWR service was absolutely amazing, very friendly and making other passengers feel safe and welcome back to the railways. An absolute credit to LNWR.
edit: Might I add that the guard who checked my ticket on the LNWR service was absolutely amazing, very friendly and making other passengers feel safe and welcome back to the railways. An absolute credit to LNWR.