Police are making final preparations ahead of the the world's greatest flat race - the Epsom Derby.

Months of planning have been put in before the festival kicks off with the Investec Ladies Day on Friday, June 1.

There will be armed officers, traffic diversions and police dogs around Epsom on the Friday and Saturday.

Chief Superintendent Dave Miller said: “The Derby is a historic and prestigious event that puts Epsom on the map and we are proud to police the two-day festival.

“We’ve been working closely with Epsom Downs Racecourse and other partners in preparation for a smooth-running event.

“Security remains at the forefront, and I would urge all spectators to be patient and cooperate fully with racecourse officials in terms of searches on entry to the event."

Police are also asking the public to report suspicious behaviour to members of staff or National Counter Terrorism Policing on 0800 789 321.

They have released a fairly common-sense list of suspicious behaviour, including buying or showing interest in illegal firearms, appearing to carry out surveillance on security measures, buying or storing large amounts of fertiliser or chemicals, and someone's behaviour changing into a "violent extremist nature".

The derby is the largest annual gathering of people in Surrey, attracting thousands of visitors, which also brings petty crime such as pickpocketing.

Police advice to avoid becoming a victim is as follows: do not bring unnecessary bags to the event; do not leave your property, including bags and mobile phones unattended and keep valuables close at all times; keep wallets and purses out of sight; remain vigilant, and be aware of those around you when placing bets and collecting winnings.