They're calling it "pre-loading" - party-goers getting drunk on cheap alcohol from supermarkets and off-licences before they go into town.
Police fear it's lead to an increase in crime and are now turning to technology to help - with a nightclub in Sussex using of a breathayser to make sure its patrons are not too drunk.
Andy Dickenson's report contains flashing images from the start.
Detectives investigating an armed robbery in Basingstoke have released CCTV footage showing a woman they want to speak to.
Shortly after 1pm on Monday, two men walked into Wonderland, off Churchill Way. Once inside they threatened a member of staff with what is believed to be a handgun, tied him up and stole more than £10,000 in cash.
The men, described as white with their faces covered, then left the club and made off towards Church Street.
One was wearing a black padded jacket and dark coloured trousers, possibly jogging bottoms. The other man was wearing grey trousers, possibly jogging bottoms, and a dark-coloured jacket.
Now detectives are appealing for help in tracing a woman who is seen in the CCTV footage to cross over Churchill Way towards Wonderland at around the time when the two men are seen walking into the club.
Det Const Richard Chegwidden said: “This woman could have vital information which could assist our investigation. If this is you or you recognise her then please contact police as soon as possible.
“We are also still appealing for anyone who recognises the two men seen entering and exiting Wonderland to come forward.”
Anyone with any information is asked to contact Basingstoke CID on 101 or Crimestoppers on 0800 555111.
Detectives are appealing for witnesses after an armed robbery at a nightclub in Basingstoke.
Police say two men walked into Wonderland, off Churchill Way, shortly after 1pm yesterday.
They then threatened a member of staff with what is believed to be a handgun, tied him up and stole a significant amount of cash.
The two men, described as white, their faces covered, then left the club and made off towards Church Street. The member of staff was not injured.
Anyone with any information is asked to call Basingstoke CID on 101 or Crimestoppers on 0800 555111 where information can be left anonymously.
A man's been sentenced to six and a half years in prison for a frenzied attack on another man in a Tunbridge Wells nightclub, leaving the victim with lifelong scars
Kevin Eastwood from East Peckham, near Tonbridge, pleaded guilty to grievous bodily harm
The victim needed more than 40 stitches