The Re-enactors; Trapdoor in Time

...Sometime in the near future, the First International Congress of Re-enactors" is suddenly interupted by an odd storm. When the storm clears, the members find themselves in 1st century Britain, caught between the Rome of Nero and the rebellion of the Celtic Iceni tribe and their Queen, Boudica. The de-facto leader of the Re-enactors, Jason MacMaster, must choose sides, and survive a plot by Drudic priests to wipe out those depending on him.