On Monday 22nd a homemade bomb exploded in Manchester "at 22:33 BST", in what Theresa May called a "sickening" act. The numbers 22 & 33 are most familiar, whilst note image below. (BBC News).
On Monday 22nd the Royal Victoria Hospital in Edinburgh burned, overnight, to the ground. (here)
Early in the morning of the 23rd, Victoria Station in London was closed; a suspect device.