Thank goodness this turned out to be hypothetical.
19:30 from Paddington ... usual crush but I got on early, put my very large indeed and heavy bag in the back of the bottom luggage rack in "B" and sat in what seemed like the only unreserved seat therein
. More people, more luggage piled in .. and as we neared Didcot I noticed a bloke locking his Brompton to the rack and (I think) he headed off for the buffet.
Coming in to Chippenham and ... I found I couldn't [easily] get my bag out. Well - OK - I struggled and
did get - but what should I have done if I hadn't been able to?