The closing date for this one is 31st May - and it is easy to overlook because of the prestigious (and large-prized) Bridport Prize that closes the same day. With a bit of good planning you still have time to enter both.
NB good planning is key as this is a postal only competition.
And the prize is not to be sniffed at:
£3 to enter for a possible 250 guinea first prize (you can feel like a race horse).
More details available here http://www.frogmorepress.co.uk/