With the acquisition of the British travel group Thomas Cook Holdings Ltd., London, in April 2001 Thomas Cook AG gained access to Europe's second-biggest travel market. UK’s third largest vertically integrated leisure business comprises the tour operator brands Thomas Cook, Thomas Cook Signature, JMC, Neilson, Style, Club 18-30, Cultura, Time Off, Sunset, Sunworld Ireland and roomsandhotels.com are all part of Thomas Cook UK. Under the tour operator brand Thomas Cook, the company offers package holidays for the experienced traveller looking for a premium product, catering equally for families, couples and adults. Offers for families, younger adults and groups who are looking for «value for money» are covered for by the JMC brand. Sunset is a tour operator for the budget conscious customer looking for the “no frills” holiday. The premium brand Thomas Cook Signature offers its customers a comprehensive range of products from which they can build their own holiday package using scheduled air travel. Style Holidays, also a premium segment brand, is the Group's specialist for exclusive hotels, apartments and villas. Neilson is the Thomas Cook UK expert for activity holidays particularly skiing, water sports and cycle tours. The UK's leading youth brand Club 18-30 offers lifestyle holidays in the mid-price category. With Cultura the company also offers a component travel tour operator in the lifestyle holiday segment. Time Off specialises in city tours and short breaks in Europe and North America, whereas Sunworld Ireland offers package holidays from Ireland to Spain, Portugal and Turkey. Roomsandhotels.com is a simple accommodation only provider offering directly and online on very competitive prices on a large range of hotels world-wide.

With more than 1,500 outlets, Thomas Cook UK is the market leader in the British travel agency business. It also owns Thomas Cook Airlines UK, Britain's second-biggest charter carrier with 24 aircraft.