Possible Clues:

• Country cart overturned - there are lots of police here
• Detectives can star, oddly, in remake
• Sherlock Holmes ally
• Force tax to come down on delivery truck? It's gone up
• Old London police HQ
• Distance unit for loch surveying?
• Nick drunkard carrying cape, bag and a lot of ale
• London CID
• Headquarters to London detectives
• Is looking out for injustice overseas in 26 across - it leads to one of those in prison