The Guardian has a long piece on the Tories 2015 election campaign and explains why some of the constituency campaigns have been investigated by the the Police. It hinges on the allocation of cost to the low limit constituency campaigns and the higher limit national campaigns. The Electoral Commission has investigated the battle bus costs and stated that,
“has found no evidence to suggest that the party had funded the BattleBus2015 campaign with the intention that it would promote or procure the electoral success of candidates”
apart from the planned location of the whistle stops.
The Guardian also quotes the Electoral Commission as saying,
“coaches of activists were transported to marginal constituencies to campaign alongside or in close proximity to local campaigners, …..
“it is apparent that candidate campaigning did take place during the BattleBus2015 campaign