Does anyone have any recommendations for a small electric bike which might fold up and be kept on board. Massive range and large wheels not so important.
See asbikes.com. I have 2 of their bikes (admittedly larger than you wish) on board and the range with twin batteries is 170 kms in the most economical assist mode. Add their shopping bags and you can carry loads of beer and groceries.
We have had non electric versions of these on board for the last 8 years or so. They have been no trouble and seem reasonably robust and came with a useful bag.