With all the publicity after the future of the Island Line Railway, apart from the rolling stock, what infrastructure/maintenance is required to bring the railway up to a satisfactory standard. I hear that the pier needs a lot of work, as does the signalling and installing new loops/removing track etc.
I would have thought that if the power is upgraded (which I understand is only sufficient to allow 2 trains to run on the line), then if you are clever with the timetable, you could allow trains to run every 20 minutes, with trains passing at the loop at Sandown Station, and on the double track section between Smallbrook and St Johns. You could even introduce an extra service between St Johns and Pier Head to enable a 10 minute frequent service due to the existing double track between St Johns and Pier Head.
I can't see why a loop at Brading would work, as apart from achieving a 30 minute frequency, the ferries from Pier Head do not arrive/depart on a 30 minute frequency, but having trains run every 20 minutes would work better to allow connections to and from the ferries to the mainland.