pm215

So, here's a proposed schedule:

Leave parents' house 06:00 (car or taxi) [14:00 JST]
Depart Manningtree 06:21
Manningtree -> Liverpool St arr 07:26
[there's half an hour's slack here]
Liverpool St -> Holborn (central line) arr 08:02
Holborn -> Heathrow (piccadilly) arr 09:04
Scheduled departure time 11:05
Heathrow -> Munich arr 12:50 (13:50 local)
Scheduled departure from Munich 14:30 (15:30 local) [22:30 JST]
Munich -> Tokyo arr 02:00 [10:00 JST]
[there will no doubt be messing around getting baggage here but for timing purposes I ignore it]
Tokyo -> Nagoya by shinkansen arr 04:00 [12:00 JST]
Nagoya -> Okazaki arr 04:30 [12:30 JST]

(Journey times courtesy of Multimap, National Rail, TfL, expedia and yamasa.) Anybody care to speculate on how much slack I ought to add at various points?

The observant will note that this plan works much better if (a) I start out already at least halfway towards JST and (b) can sleep on the plane...