I recently tried a roti and a mauby from a restaurant I had long believed was shuttered. Chaconia stands out amongst its neighboring Nigerian bakery, Tesco and pound shops because of it's very noticeable Trini flag sign, but it constantly seems closed. It turns out that they have an issue with their gate which was only just resolved. Beforehand one had to knock on the door to get let in. Now you still have to do that sometimes, but there's no big intimidating metal gate in your way.
The staff are very friendly (two person team) and most of the cooking seems to be done by a dedicated older Trini woman. The bread is made fresh for every roti (dal puri in my case) and the curries are all around 3.50. That means that a tremendously large roti with two veg and goat curry comes to 5 pounds. Their goat curry is probably my favorite thing about the place and it comes boneless at no extra charge (which is helpful when you're basically eating a burrito.) Pumpkin curry and potato curry were added to my roti at no extra charge and both were very noticeable in the grand scheme of perfectly cooked goat.
The mauby was passable, but at 80p a cup I'd really like to try the homemade sorrel.
This place serves one of the best rotis I've ever had in the UK.