Prosecutors are set to announce whether a string of Conservative MPs and officials will face charges after allegedly breaching spending limits in the 2015 general election.
Some 14 police forces have sent files to the Crown Prosecution Service (CPS) - which are understood to refer to more than 30 individuals - and decisions on charges are due in late May and early June.
Yesterday’s announcement of a snap general election would have no impact on the timing of decisions on whether to press charges, a Crown Prosecution Service spokesman told the Press Association.
Allegations highlighted by Channel 4 News and the Daily Mirror relate to busloads of Conservative activists being sent to key seats – whose expenses were reported as part of national campaign spend rather than falling within the lower constituency limits.
The CPS declined to say which constituencies are involved, but said files had been received from the Metropolitan Police, as well as forces in Avon and Somerset, Cumbria, Derbyshire, Devon and Cornwall, Gloucestershire, Greater Manchester, Lincolnshire, Northamptonshire, Nottinghamshire, Staffordshire, West Mercia, the West Midlands and West Yorkshire.
UKIP leader Paul Nuttall suggested that Theresa May's election announcement may have been motivated in part to avoid "the prospect of a slew of Tory-held by-elections caused by the seeming systematic breach of electoral law at the last election, predominantly in places where UKIP were pressing the Conservatives hard".