By now you'll have seen the finished Falmouth police 'Gangnam Style' video - so why not have a giggle at behind the scenes footage that didn't make the final cut?

Falmouth police's “Gangnam Style” video, which features neighbourhood sergeant Gary Watts and colleagues, has already garnered more than 180,000 views online.

It seeks to benefit Joshua Wilson, a 12-year-old boy from Bury in Lancashire who was first diagnosed with a brain tumour in 2004 and now has severe neuromuscular disabilities that require a fully-adapted home.

The idea for the tongue-in-cheek video came when someone on behalf of Josh, who is a big fan of the police and fire service, requested a police helmet through social networking website Twitter.

After headquarters authorised the request, Sgt Watts was able to send the young boy a pre-used helmet that he wears with pride.

The sergeant then vowed to recreate the popular Gangnam Style dance if he reached 5,000 followers on Twitter before the end of the year, a feat he duly accomplished with a little help from the #GangnamPoliceman hashtag.

“Once it dawned on me that this could really happen I wanted to make something good come from it,” Sgt Watts said.

Read just how successful the charity video was here.