Thinking of a trip from Paddington to St Ives in May, 2 people both senior railcard holders, I'm confused as to ticket options on GWR's site as in one place they quote £70 to book a cabin for double occupancy on top of rail ticket. Currently two advance tickets total £55.40 there does then appear an option to book cabin, other options appear to be more expensive i.e. Twin cabin shared use £169