Ok, that link leads to the Huron Carol
version of the tune, and if you go to that guy's website (seriousguitar.com) you can find the tab plus notation for his version (click on Free Guitar Tabs and then Christmas Guitar).
Claughton wrote: I did place an enquiry on here regarding a guitar version for the medieval carol Gaudete but I got no response. I am still looking for a decent guitar arrangement if you have any suggestions I'd be grateful.
You can find this if you Google 'Gaudete Tab' - one of the links you find is for Easy Guitar with Tab which has a fairly straightforward arrangement of the tune.