To be honest Euro-Militaire and Salute are the two biggest in the UK and imo they are the best of the shows, they are completely different to each other as well as Euro-Militaire is a two day event and covers mainly the larger scale and historical so the traders that attend mainly cater for this.
A lot of the other shows around the UK don\'t all have a painting competition and a lot of them are more for the gamer.
To list a few more for you:
Crusade end of Jan
Fiasco October or November
Ravage unfortunately this is in Paris and I will get there one year but not this one

and is also a weekend show not a one day event
And of course there is GW\'s own Games Day in September.