shame they aren't feeding some refreshments to the 'guests' they invited because of their community and charity work. it is going to be a long day for them: a 9 am start, lots of waiting and hanging out in the open air (which, in UK, is quite treacherous given the potential for rain at anytime!). they've allegedly told them to bring picnics - the sight of all these guests coming in in their sunday best clothing with picnic bags sounds not too appealing for PR purposes. surely they could have organised some drinks and nibbles? nothing too fancy, just tea and coffee and some sandwiches would have sufficed for them to keep fed and hydrated over all the waiting time - the lease you'd want is to see people carrying tesco bags to the royal wedding.
now seriously... given these people have done extraordinary things for their communities, i think sandwiches and tea isn't much to ask for. i think this will come back to bite them if they don't fix it.