The self-styled "non-league football robber" has struck again.

Players from Tonbridge Angels returned to the changing room at Burgess Hill after Saturday's match against the Sussex side to find money and valuables missing.

Police believe the culprit is the person who has been preying on non-league soccer clubs across the county.

The trickster gained the confidence of club officials by dressing in the Angels' strip and mixing with them in their dugout. He slipped into the changing room unchecked and helped himself to watches, credit cards and cash before vanishing.

Burgess Hill manager Gary Croydon said the club was stepping up security. He told The Argus: "He gets past the stewards and we will now have to lock the changing rooms. It makes it very awkward. We are going to have to physically let people in and out."

It is thought to be at least the fourth time the crook has struck.

The Argus is now sending posters to all Sussex County League and Rymans League clubs in the county warning them to beware.

Our poster reads: "A thieving imposter is getting into changing rooms of non-league clubs by tricking staff into believing he has permission to be there.

"He has been posing as an opposition player and football manager. Once in, he steals mobile phones, credit cards and cash. Watch out - don't be fooled by the non-league robber."

Sidley FC was targeted last month during a match at Crowborough when property including mobile phones was taken.

Players rang one of the stolen mobiles and a voice said: "Unlucky mate - you've just been done over by the non-league football robber."

There have been similar thefts at clubs including Wick and Three Bridges.

Inspector Martin Pattenden, of Burgess Hill police, said: "We will now be investigating a link between offences."