I can only rate the delivered food, and I only had their lamb chops, but if that was indicative for the rest of the food, they are in trouble...
While the sides (naan bread and veggie curry) were OK, the lamb chops were tasty, but too thick, way overcooked and therefore extremely tough. To me it was more like mutton than lamb.
However, this is just my experience, and it might well be that other dishes are very good.
EDIT:
I have recently tried this place again, and I ordered (delivery) their Tandoori Mixed Grill. The naan and veggie curry again were OK, but the chicken was very dry, and the lamb chops, the kebab and some added pieces of beef (?) were very tough, up to the point that even Jaws would have a hard time.
Another issue was that the seasoning was way too salty...
I am all for a second chance, but this will be my last order from them, and I have lowered the score to 1 star. If the same quality came to my table while eating in, I would have sent it back.