Ok i suggest that we get the train to victoria (1 pound)
Then hop on a coach that will take 1hr 30 - 2hr to Canterbury.
Why, because it is a lot cheaper. Pricing and Departure:
Departer Arrives Duration
07:00 09:00 2hrs 0 View WC From £4
08:30 10:20 1hr 50min 0 View WC From £6
09:30 11:20 1hr 50min 0 View WC From £5
10:30 12:20 1hr 50min 0 View WC From £6
11:30 13:20 1hr 50min 0 View WC From £5
Return:
Departs Arrives Duration
05:40 07:35 1hr 55min 0 View WC From £5
06:40 08:35 1hr 55min 0 View WC From £5
07:40 09:35 1hr 55min 0 View WC From £5
08:40 10:35 1hr 55min 0 View WC From £4
09:05 11:05 2hrs 0 View WC From £6
09:50 11:50 2hrs 0 View WC From £5
10:50 12:50 2hrs 0 View WC From £4
11:50 13:50 2hrs 0 View WC From £5
12:50 14:50 2hrs 0 View WC From £5
13:50 15:50 2hrs 0 View WC From £6
14:50 17:05 2hrs 15min 0 View WC From £5
15:50 17:50 2hrs 0 View WC From £6
16:50 19:05 2hrs 15min 0 View WC From £4
17:50 19:50 2hrs 0 View WC From £6
19:00 20:40 1hr 40min 0 View WC From £4
19:00 21:05 2hrs 5min 0 View WC From £4
20:00 21:40 1hr 40min 0 View WC From £4
21:00 22:50 1hr 50min 0 View WC From £4
/Edit
Some problems have come to my attention;
These will require booking and we can't pay on the day
These may not be return and therefore might cost 10 pounds (altogether)
anyway:
more info round harts tomoro