“I think members of the public are becoming increasingly frustrated with photos and campaign visits when they want to see him sat down dealing with Brexit and other important issues.”
Commissioner Drew Harris warned about the strains on policing an upsurge in dissident attacks.
Pro-Brexit MPs called it an ambush, but Luxembourg PM Bettel said it is UK citizens abroad who are being held hostage for "party political gains".
The billboard is the latest poster from campaign group Led By Donkeys.
Top court to adjudicate after it was found that Boris Johnson lied and suspended parliament to stymy MPs.
For the country to heal, the truth must come out and those who did the country harm must be brought to book.
The latest spending figures come after the Conservative Party was accused of misrepresenting a BBC News article in a misleading Facebook advert.
The timely artwork, titled 'Devolved Parliament', may become Banksy’s most expensive artwork, and is expected to sell for more than £1.5M, according to auctioneer Sotheby’s.
The Conservative former prime minister has recalled the day after the EU referendum in his memoir.