In 2016 an investigation by "Channel 4 News" revealed that the Conservative Party had spent many thousands of pounds centrally on battlebuses to transport activists, and hotel accommodation for the activists, who went to campaign in marginal constituencies, including South Thanet. The expenditure on the buses was declared by the Conservative Party on its national declaration of "Campaign Spending", but in some cases the hotel accommodation was not declared at all as election spending when it should have been. In addition, there is controversy about whether the expenditure, both on the buses and the accommodation, should have been declared on the declarations of expenditure for the constituency made by each candidate's election agent. Kent Police began an investigation into the spending returns of Craig Mackinlay following the Channel 4 report.