The Gourmet Market are an online store that stock the best products from recognised Spanish producers; their customers include Michelin starred chefs & a range of restaurants in the UK! A range of cuts are available for delivery on their site, including halal wagyu beef, which you can get delivered in London
They have a bespoke ‘halal butcher’ section on their website, & all items ordered from the halal section come with a halal certificate from the slaughterhouse, for your peace of mind.