Peter, you got me thinking about a small guitar after this post rather than the old clunker I take out on the boat occasionally. Went on gumtree and picked up one of these secondhand for a

song (almost) with a little gig bag and not a scratch.
http://metromusic.net.au/catalog/index.php?cPath=24_25

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Has a full size neck but a very slim body , best played with a strap or resting on a pillow but can be played low on your knee. A fairly rigid top because of the small size so not much volume but thats not its purpose. It will be fine for a few blues and ballads on the mooring or round the fire when camped in the van. It needs a new set of strings so Im putting a set of ultralight acoustics on, which will quieten it down even more, but it wont annoy the neighbours in the mooring zone.
I think its a lesser copy of the Martin Packpacker , which is one of the better travel guitars available. Anyone interested, if you look online I imagine these come up occasionally.