By Daniel Hunter

Retailers are set for a happy Halloween as analysts predict a £330m boost to sales over the spooky one-day holiday.

Planet Retail has forecast a 3.5% rise in sales compared with the run-up to Halloween last year.

“It represents remarkable growth when compared to the £12m value of the UK Halloween goods market in 2001,” the analysts’ report said.

Around two-thirds of Brits are expected to celebrate Halloween in some way and retailers have already noticed a surge in sales. Waitrose reported a 10% rise in like-for-like sales after it launched its Halloween decorations and confectionery two weeks earlier than last year.

Sainsbury's is expecting to sell around 1.5 million pumpkins, one million of which are expected to be sold this week. Last week, Asda said its pumpkin sales were already 20% up on last year.

According to Conlumino, clothing and costume sales are expected to be worth £148m alone.

Halloween is a quickly growing holiday in the UK. Angels Fancy Dress, the UK's largest fancy dress chain, is expecting sales of £2m this year - more than double the amount it took in 2007.

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