Jeremy Clarkson banned a customer from bringing their own birthday cake to his pub, The Farmer’s Dog.
The former Top Gear host, 65, launched the revamped Cotswolds pub last August, close to his 1,000-acre Diddly Squat Farm.
He is passionate about his “100% British” campaign for the establishment, meaning everything he sells uses ingredients within a 16-mile radius of the venue.
The Grand Tour star previously admitted his rules are costly and claims he is losing £10 for every customer who eats at his restaurant.
Clarkson has extended the local produce rule to punters bringing in their own birthday cakes - which must be obtained following the same rigid rules.
A punter was warned about the guidelines when they emailed to ask if they could bring a celebratory cake for their big day, reported The Sun.
In an email, the Farmer’s Dog replied: “As part of our commitment to back British farming, we kindly ask that only 100% British food products are brought into the pub, this sadly includes birthday cakes.”
Clarkson talked about the struggle of sticking by his rules in his Times column, admitting, for example, that black pepper costs ten times more to buy in the UK than abroad.
“Now, a business-minded person would look at these costs and realise that with British-only rules in place, a hotdog was going be priced at about £45,” he penned.
“But I’m not a business-minded person. So I just filled my heart with hope, asked an AI program to work out what the average price of lunch in a Cotswolds pub is and just charged that.
“It’s possible that for every customer who comes through the door I’d lose about £10.”
Clarkson previously faced backlash for not stocking ketchup at his pub as he couldn’t find a fully UK-sourced one.
However, over the summer, it was added to the menu after he reportedly found one from the UK firm Condimaniac.
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The condiment - at £7.95 a bottle - uses Isle of Wight tomato passata, apple cider vinegar from Hampshire, Essex salt and British sugar and onions.
Clarkson has been keeping fans updated with the highs and lows of the pub business, from being swindled out of £28,000 by hackers to dealing with food intolerance fraud.
Last month, he exposed the “baffling” toilet habits of customers.
When asked what he has “learnt” about running a pub, he said in an Instagram video: “It's difficult and it’s confusing and it’s hard work. Baffling.
“The thing that baffles me most of all - forgive me for this - but people go to the lavatory, sit on it and somehow miss the bowl and I cannot understand how they’re doing it!”
He added jokingly: “And apparently you're not allowed to put CCTV in the cubicles so we'll never know.”
Gesturing in frustration, the bewildered presenter went on: “It's just... how have you got it all over the floor and up the walls?
“There's a lot to infuriate me.”
The Clarkson’s Farm star added that, on the upside, he believes he has built up a dedicated following of customers who appreciate his pub for only serving food that has been reared or harvested on his nearby farm.
