I can see how to do this but for my recent trip round the Peak ITT there is a data point every 10 minutes or so. the website displays these as pages and pages of locations. I can export these as GPX tracks - but only a page at a time. this means there is 6 separate tracks for my route.

my question is how can I export them as one continuous GPX track.

I like my spot, and particularly that it means them at home can be reassured of my general whereabouts and that I'm still alive, but their website ain't that good!

Looks like the Advanced Download does what you want (you can select a date range and export type). If that's not right for you, there are quite a number of GPX merge tools out there, or you could do it manually easily enough by copying the <trkpt> ***** </trkrpt> sections into a single file.