My thoughts/opinions/questions:
1) The Abbey line - Surely there is a case for reopening back to Hatfield, avoiding the need to travel into London and back out again to get to Hatfield?
2) Devizes - Is this being linked from the West, or from the East? There are only around a dozen properties in the way, preventing a full re-instatement of the line from east to west.
3) Isle of Wight - How will they get back to Ventnor? The trackbed in Wroxhall has been built over, unless there are proposals to CP these properties. Re-instating to Newport is somewhat easier, although a station would have to be on the outskirts of the town.
4) I am surprised that Marlborough hasn't been included yet. The existing Paddington to Bedwyn service could easily be extended to terminate at Marlborough instead - on a re-instated alignment - and actually terminating at somewhere of more significance.