The idea of taking young offenders on an all-expenses paid holiday as a means to rehabilitation has long been demonised by the likes of the Daily Mail.

So, there should be rejoicing when this group of teenage tearaways ends up sliced, gouged, mauled and torched after their camping trip doesn't go quite as planned.

The boys - including hard loner Callum (Kebbell), vicious bully Steve (Wight) and put-upon Lindsay (Ben McKay) - are under the watchful eye of dour warder Jed (Pertwee).

They've been taken taken to a remote island for a bootcamp after a fellow inmate - young Davie (John Travers) - was driven to slash his wrists after constant bullying.

It's quite a culture shock for the lads - most of whom appear to be a variation of Wayne Rooney - who are used to institutionalised living in a prison where an ASBO is the equivalent of a masters degree.

However, they discover the island is not deserted - a female warder (Reid) is on a similar rehabilitation course with a couple of mouthy slappers.

It's got the makings of one big party under the stars...until a mysterious predator begins taking out the not-so-happy campers one-by-one.

Writer-director Michael J Bassett's horror-thriller is that type of typically British movie that may have no budget but more than makes up for it with sheer invention.

He also ratchets up the scare factor by making the would-be victims not only vulnerable to the unseen killer but to one of their own as well.

A largely unknown cast spout sparky, believable dialogue and the script is shot through with an appealing black humour.

It won't win any prizes for originality but it's rough'n'ready, gritty approach will appeal to those who would relish Scum crossed with Deliverance.

Tim Evans