Boston Tea Party, the coffee shop group founded in Bristol, has launched a new menu and confirmed the opening of its 16th café in Plymouth’s Sutton Harbour and is planning its next sites to broaden the reach of BTP across southern and eastern England, M&C Report has learnt.

The new site is due to open in June overlooking the harbour in the Jamaica House building on Vauxhall Street after a refit to the grade II listed site which was formerly used to house potatoes from merchant ships.

The newest BTP will operate from 7am to 9pm offering craft ales, wines and small plates of food in the evenings across a two floor, 180-seat coffee shop and restaurant

The group is currently in advanced legals on its third venue in Birmingham to open in the Moseley area of the city in the autumn. It is also looking at a potential second site in Bath.

Marketing manager Ben Hibbard told M&C: “We are looking at various places across the south including Bournemouth, Southampton, Cardiff, Brighton and Winchester – any market towns across the south. The thought is we could potentially do a fourth in Birmingham then look to see how we could progress eastward and across the south as well.”

Bucking the trend of operators struggling to find suitable sites, Hibbard said BTP is being offered a lot of sites at the moment as its profile has risen in recent months and could be opening at a faster pace as landlords and agents are approaching the company with new sites.

Meanwhile the company has extended its lunch menu to include a selection of mezze and small plates.

New items are inspired by traditional Middle Eastern delicacies including roast lamb or halloumi pittas; sesame, soy and chilli marinated chicken with brown rice; baked chicken enchilada and two new salads – cauliflower and cous cous or beetroot and goats cheese.

The company has 15 cafes across the west of England and the Midlands. In 2014 it opened its largest site to date at Gloucester Road in Bristol and its first venue in Cheltenham which became its busiest restaurant within two weeks of opening.