Interesting - and quite good - flight times, for both the business person and the tourist.
It would be possible to depart in the morning from either DUB or BHX and have a full day doing business before returning to the respective city in the evening. Whilst this is possible regardless of your starting city, this is especially possible for the BHX-DUB-BHX traveller. Sadly, it is not as good for the DUB-BHX-DUB traveller: the first evening flight is at 1940. Nevertheless, pretty good times.