Correct.
With reference to clue 5, from Strood there are through trains to London Bridge Blackfriars and St. Pancras. Cannon Street, Waterloo East and Charing Cross can reached by changing at London Bridge (there are also a limited number of through trains). Victoria can be reached by changing at Rochester and Liverpool Street, Moorgate and Paddington by changing at Abbey Wood. Kings Cross and Euston are both within walking distance of St. Pancras and Fenchurch street is within walking distance of Liverpool Street leaving only Marylebone needing more than one change of train and then only when there are no through trains to Charing Cross.
Your turn to take the next Class 375 to Paddock Wood.