KFC has issued a tongue-in-cheek apology after a delivery crisis left thousands of chicken fans across the country unable to get their hands on their beloved bargain buckets.

After being bombarded with complaints about closed stores, limited menus and burgers with no lettuce, the fast food giant decided to post a "sorry" advert in newspapers this morning.

The apology features an empty bargain bucket with the letters 'FCK' on it - an anagram of KFC, reports Daily Mail.

It appears to have won back some unsatisfied customers, with Twitter users branding it "the best advert".

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One described it as "the perfectly pitched apology", while another posted: "KFC" apology in the newspapers.

"This is soooo funny! Is swearing now accepted as part of official English language?"

Others were less impressed, with one person commenting: "Not really sure this makes things better....a simple sorry would have sufficed, rather than trying to be down with the kids. For KFC's sake."

The Advertising Standards Agency told MailOnline it has not received any complaints about the apology.

In full, the newspaper ad reads: "We're sorry. A chicken restaurant without any chicken. Huge apologies to our customers, especially those who travelled out of their way to find we were closed.

"And endless thanks to our KFC team members and our franchise partners for working tirelessly to improve the situation.

"It's been a hell of a week, but we're making progress, and every day more and more fresh chicken is being delivered to our restaurants. Thank you for bearing with us."

An apology advert from KFC has appeared in newspapers across Britain this morning. Photo / KFC
An apology advert from KFC has appeared in newspapers across Britain this morning. Photo / KFC

The crisis at KFC follows the company's decision to ditch its existing delivery company Bidvest Logistics in favour of DHL, which took over just last week.

A failure in its computer system meant that deliveries out of its vast hub and warehouse in Rugby went into meltdown.

Restaurants ran out of chicken and were forced to shut, making the chain a laughing stock on social media. Some restaurants have re-opened but still with limited menus.

It has also seen people trying to cash in by selling "rare" bargain buckets and boneless banquet meals on Facebook and eBay for anything from £100 to £25,100.