M&S has hidden Rudolph sweets in packs of Percy Pigs and you could win £50 if you find it

MARKS & Spencer has hidden Rudolph sweets in packs of Percy Pigs and it'll give you a £50 gift card if you find one.

The festive sweets, which taste of cola, have been put in 1,000 bags in stores across the UK.

You'll only be able to find them in the Christmas-branded Percy Pig packs though, which weigh 170g.

They currently cost £1.65, or you can pick up two for £3 at the retailer.

They're available in all M&S stores apart from those in Northern Ireland and the Republic of Ireland. You can find your nearest one using .

The competition was announced by M&S on Facebook this week and it proved popular among Percy Pig fans.

One user said: "I had to buy ten packets for a work thing and no Rudolph.

"Live off them though, so will be buying more!"

While a second added: "Adore Percy pigs I want to find Rudolph in a pack."

If you're one of the lucky few, you'll need to post the packaging to M&S in which the Rudolph treat was found before January 31.

You'll also have to include your name, email address (or postal address if you don't have one), phone number as well as the date and name of the store that you bought the sweets in.

Its address is: Marks & Spencer, Percy Pig Xmas, 35 North Wharf Road, London W2 1NW.

Sadly, you'll have to pay for the postage costs yourself, but given that you'll get a £50 voucher for the trouble it should be worth it.

Once M&S has received the pack, it'll send the gift vouchers via email or by post if you don't have an email address.

The £50 gift cards are then valid for 24 months from activation.

M&S this week launched Percy Pig muffins – and they taste just like the sweets.

If one Percy Pig won't cut it, you should check out the new M&S Percy pig advent calendar.

Even better, M&S has confirmed that Percy Pigs will stay veggie forever.