By 1200z tomorrow the UK will be under an area of ash. Fortunately, most of that will be low or medium concentration which many airlines are now approved to operate within.
I looks like Scotland will be underneath an area of high density ash which may well see a stop to nearly all flying tomorrow although it looks like Edinburgh is clear of the red area by 1200.
Also, the airspace will not be closed like last year. The airlines will be given the information and left to decide whether they want to fly through it.
What happens later in the week is still up for discussion.