Slovakian Dance. I believe this dance group were visiting performers who knew the traditional regional lively dance forms while the cimbalom (type of dulcimer) player (on the left) could be a local performer as he has been seen before in a folk group. The violinists were the stars.
In Newcastle, the cimbalom artist compered the show, (was he the main English speaker?) and, what's more, a member of the audience (not me) succeeded in identifying the cimbalom!
Pardon my ignorance, after several months I am fairly sure it was Slovakia and not Slovenia.