Hello all. I've asked the firstcc twitter feed but strangely it doesn't seem to be active today, so I'm hoping you guys can help with this query. I just need to know, am I allowed to make a break of journey at Potters Bar on a Royston to London Terminals Super off peak single for travel today? I've searched around for the answer the best I can, but the National Rail website basically just says "it depends - phone this expensive phone number to check". Thanks.