Mitchells & Butlers has unveiled a £1.5m investment plan to boost its fastest-growing pub brand, the Ember Inns chain. The pub retailer has earmarked the money for the conversion of four pubs into its award-winning "home from home" concept. The latest investment brings the total number of Ember Inns to 140 and is the fastest roll-out of any M&B brand, according to communications director Bob Cartwright. "It has been a hugely successful brand because we have re-invented the local pub for all the community to enjoy," he said. Cartwright explained that 70% of its business was in suburbs, which meant the company had responded by investing in suburban pub developments. "To roll out 140 pubs in three years is quite an achievement and highlights our commitment to the brand," he said. "It is an on-going investment and the latest four pubs are due to re-open in May and June. "Other conversions will take place during the year as we identify the right sites." The latest developments include the Nut and Squirrel in Milton Keynes, Bucks, which is due to re-open this month after a five-week refurbishment. The Britannia Inn, in Headington, Oxford, will re-open in June and the Black Horse in Orpington, Kent, is undergoing a four-week conversion and is due to re-open later this month. The final pub earmarked as an Ember Inn is the Nightjar in Poole, Dorset, which re-opens in June. Designed to be traditional pubs with a contemporary twist, Ember Inns feature wooden flooring, modern art, real fireplaces and lots of cosy nooks with leather sofas and armchairs. Cartwright said they had been successful because they have attracted a wide age mix, not only from regular customers, but those who have stopped going to pubs but wanted to try out the new style.