The correct dates are here if you want verification - employers etc. should definitely be told if they have it wrong!
https://www.gov.uk/bank-holidays
I suspect that a LOT of people will end up taking Monday off as well as Friday - if the economy dips even more than expected in May that may be one of the reasons.
Note - this is not cross-posted from Dreamwidth because Livejournal seems to be rejecting crossposts at present.