Bringing the mini-Trangia, pan and cup for a brew might just go in my 'Camper Longflap' along with the bivi, sleeping bag etc, otherwise it's pannier time...
If I have everything organised, I should be able to leave by 18:30, which means Witham-wards by about 19:45...and hungry by then. Or I try and re-schedule work and leave a bit earlier