But I may try train to Dover, old-fashioned cross-channel to Calais, then take pot luck with local trains. Avoids the hassle of packing bikes for flying.
If you are taking train to London then best to take train to Harwich and boat to Hook of Holand and then train on to Amsterdam and then Germany.
Thanks, that was my original thought but it means a more expensive overnight ferry which also means paying for a cabin (or an overnight stay in Harwich), and then a longish train journey.
Current thought is train to Dover, ferry to Dunkirk, cycle to De Panne (10 miles, just inside Belgium), train to Welkenraedt (other end of Belgium) then a 60m ride (much of it through a national park) to Bonn which is where I was wanting to start from, for the Rhine cycle path. The Belgium train service website tells me it will cost 21 euro plus 5 or so for the bike, and take 4 hours. Although in writing this down I realise there'll still need to be an overnight somewhere, before getting to Bonn.
A bit off-topic, but I now need to decide to take a tent etc. or go lighter and stay in youth hostels (will be going late Aug / early Sep).