The Exhibition is to move from London to the Midland Air Museum at Coventry which should help those who miss the London Exhibition. It will not be the full Exhibition but should be worth a visit. The Museum at East Fortune (Edinburgh) usually do similar, but there is a lot of Concorde associated work going on there and I do not know if they will have a similar exhibition this year. Dates for Coventry are 23 Aug - 4 Sep. The GAvA exhibition at Cosford has been extended and paintings replaced with new ones (or rather will be shortly).
There is an exhibition of military if not aviation art to be held at FAA Yeovilton in september, so one way or another the Aviation Art roadshow should be available to most people within resonable distance, except Northern Ireland who always dip out on these things.