The exercise sponsors should be aware of the need to issue a cancellation NOTAM once the airspace was no longer needed by them, in these days of Flexible Use of Airspace and sharing. Sadly, some MoD units are much better than others at doing so.
followed by
The NOTAM was cancelled by H1265/05 on 11 May at 1525 as activity had been completed.
Seems this MoD unit deserve brownie points as one of the good guys then
As
Rustle said, the only improvement to be made would be the addition of the contact phone number or RT frequency (if available).