James, if I`m not mistaken, was it you that published a write up about your experiences at Hastings somewhere??
A very good question. I would suggest you look through the Azincourt Alliance web site (English version) thoroughly.
I`m sure a quick e-mail to the Azincourt Alliance wouldn`t be a bad thing. They are all very friendly and helpfull.
For a start, if you were to go over as an individual then you would be expected to have public liability insurance to a minimum of 5million pounds.
As far as combat is concerned, they tend to follow the E.M.A. guide lines. If you are not familliar with these, a run down can be found on the Azincourt Alliance web site in the "safety" section.
If you took part at Hastings then at least you have a little experience with european re-enactment fighting styles. Although after saying that, the guys on the continent go in much harder than some of us in the U.K. lol.
By far the best way would be to join in with a group as their guest and try to get to meet up with them at least a few days before the event. This way you will be under their insurance and should get the chance for a little instruction/preperation.
Our group usually muster the weekend before at Chepstow Castle (South Wales) and travel over to our site at Azincourt about 4/5days before the event. So getting the chance for a bit of sight seeing over there.
Hope this is of some help. Please feel free to contact me with any more queeries.
G.