Depending where you mean in the UK, everywhere has Monday as what is called a "Bank Holiday". That means most people have the day off. In some areas (more so in the South, but not exclusively) we also have Good Friday as a Bank Holiday. But in the Midlands and North of the country, many areas don't have the Friday off, but have Tuesday instead (part of our varied industrial heritage!).
But, as Vstep are Dutch, what holidays we have in the UK may not have a great effect.
In any case, 4th April is looking to be the current favoured date (although 28th March is also mentioned elsewhere). In any case, don't get your hopes up. This/these is/are just scheduled, not promised...