Right. First of all, you need to be looking at
this page
You will see something that looks like this:
In the left-hand column (with the
green border) you will see a description of where the GPS track was made. Mostly, you won't understand it, but there are lots of place names here (most of them in Holland or Belgium). You will also see a small icon. A red motorbike is a motorcycle track, a blue bicycle is a bicycle track, and a green hiker is a walking route.
In the right-hand column (with the
yellow border) you will see a phrase including a location, usually a province of the Netherlands. Here are the key translations:
motortocht = motorcycle tour
MTB-tocht = mountain bike tour
fietstocht = bicycle tour
wandeling = walking route.
You will also see the phrase skatetocht or skeelertocht. These are routes for inline-skaters, which basically mean they are along bicycle paths with good smooth tarmac.
Most of these are, as I said, in the Benelux (that's Belgium, Netherlands, Luxemburg, which form some kind of an administrative love triangle). However, there are also several motorcycle routes through Europe, which could be interesting.
But to get back to Hans' (Sigmund Freud) question: Is there a similar database of GPS tracks in the UK?