Coffee News.

Onyx Coffee Lab is taking over the Rosslyn London Wall bar in London on September 26 and 27, serving its own coffees, retail range and two collaboration drinks. The Arkansas roaster’s programme includes the Onyx Delight honey-cinnamon latte and a London-only Malted FOMO americano with English beer syrup, alongside Rosslyn’s usual City coffee-bar setting.

Why it matters: this is a short, concrete chance to try a leading U.S. specialty roaster without leaving London, hosted by one of the city’s most practical high-volume coffee groups. Rosslyn’s London Wall branch is close to Moorgate and the Barbican, so it is an easy add-on for a weekend central-London plan. Check the host’s channels before travelling, since the takeover is limited to the stated two-day window.

WatchHouse will run its first pop-up coffee bar at Frieze London in Regent’s Park, London, from 14 to 18 October, serving espresso, filter coffee, iced drinks, pastries and sandwiches across the fair’s preview and public days. The London specialty-coffee operator announced the partnership on 15 September and will bring a curated menu to the fair rather than opening another permanent House.

Why it matters: Frieze is one of London’s major autumn cultural weekends, and this makes a serious coffee programme part of the visit rather than an afterthought. It is also a useful signal of how an established local roaster is taking specialty coffee beyond its regular sites, with clear dates and venue details for anyone planning an art-fair weekend.

Allpress will hold its 2026 V60 Championship Sydney heat at La Marzocco in Botany, Sydney on 24 September, with tickets released on 4 September. The elimination-style pour-over competition gives brewers nine minutes to prepare, grind, brew and serve, with the Sydney winner progressing to the ANZ final in Melbourne.

Why it matters: this is a genuinely useful date for Sydney’s filter-coffee crowd, not a routine cafe promotion. It also links local brewers to a wider programme spanning Australia, Singapore and London, with regional winners travelling to Tokyo for the World Coffee Championship experience.

THE BARN’s Holloway Road café in London will host Sage Latte Masters on Sunday 27 September, with 16 baristas competing in a latte-art throwdown alongside workshops and free entry for spectators. Sage, THE BARN and Oatly are presenting the afternoon, with competitors using THE BARN coffee and Sage’s Dual Boiler machines.

Why it matters: London has plenty of casual latte-art events, but a free, clearly structured competition at a specialist roaster is a useful diary date for working baristas and coffee-curious visitors who want a more participatory way into the city’s scene.

Caffè Culture 2026 takes place at London’s Business Design Centre on September 29-30, bringing together specialty coffee, tea and cafe-bar suppliers, products and education for the trade. Organisers describe more than 120 exhibitors and a programme aimed at operators and industry professionals.

Why it matters: This is a practical fixture for people following London’s coffee-business ecosystem, particularly those interested in equipment, service and menu ideas that may soon reach local cafes. It is also a clear date for specialist visitors who want a concentrated view of the sector beyond individual shop openings.

Rosslyn London Wall in London will host Coffee Collective for a full two-day takeover on 29 and 30 August, with co-founders Klaus Thomsen and Casper Engel Rasmussen serving the Copenhagen roaster coffees from 8am to 3pm. The event is walk-in and also brings a Forno-made BMO bun to the counter.

Why it matters: this is a rare chance to taste a leading Copenhagen roaster with its own team behind the bar, rather than simply on guest espresso. The London Wall setting makes it an especially practical weekend stop for readers around the City.

GAIA is preparing to launch a mobile specialty-coffee concept in London Fields, London, centred on East London-roasted coffee, matcha, artisan pastries and a small community-investment model. Its official site says the project will reinvest five percent of revenue in grassroots work across Hackney, Tower Hamlets, Poplar and the Isle of Dogs.

Why it matters: A mobile opening is a lighter signal than a permanent cafe, but GAIA’s stated coffee focus and practical social remit make it worth tracking for readers moving through east London. The exact launch date is not yet public, so this is best treated as an opening watch rather than a confirmed visit recommendation.

WatchHouse says its new house at 251 New Kings Road in Parsons Green, London, will open in August 2026. The specialty-coffee group has published the address and a coming-soon notice, placing the new site between Fulham Broadway and Putney's established independent coffee stops.

Why it matters: this is a useful opening watch for anyone planning coffee around west London this month. WatchHouse's house-by-house approach makes a new neighbourhood location more meaningful than a routine chain rollout, while its exact opening day is still to be confirmed.

Cup of Joy opened in Marylebone, London, on 27 July, bringing the Istanbul coffee shop’s first international outpost to 28 Blandford Street. A current London openings report confirms a specialty-coffee programme, rotating guest roasters and founder Gökçe Kalyoncu’s own handmade ceramics alongside breakfast and pastries.

Why it matters: This is a concrete new opening rather than an early watch signal, and the guest-roaster focus gives it more interest than a standard all-day cafe debut. Marylebone is already a useful coffee district, so this adds a new reason to make it part of a central London route.