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Send parcels to various hotels with change of clothes etc and pre book return shipping.
I tried that at Durness. Didn't work - for some reason they kept the parcel at the Post Office rather than delivering it to the hotel just round the corner. Happily one of the friends I was riding with had a dicky knee, so drove up in the rental can with all our luggage so I didn't have to eat dinner in a Castelli speed suit.
No other way to carry stuff between hotels (unless I go panniers)