I have 22 day continuous interail pass, and planning to catch 01.24 Exeter-Paddington arrive 05.04 on 25th Sept, then the 07.01 London-Paris Eurostar. I haven’t booked as through reservations, so if the 01.24 Exeter-Paddington(sleeper) gets in too late for 07.01, will i be allowed on following service with my 07.01 reservation? Have plenty time Paris for train onto Milan.