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Take your pick, B&Q own brand is probably the worst. Johnstons or Leyland Trade are decent options in the budget price range. Dulux Diamond Trade for hallways or anything you might want to wash.
Try to get a trade version of whatever brand you choose as they have less water and more solids in. F&B/Little Green etc. emulsions are not trade paints and very often take 3 coats to get full coverage. The fancy brands use higher quality 'fillers' and pigments.
Mylands is one of my current favourites for fancy paint.
We used b and q to match bathroom paint previously and weren’t very impressed with it. Does anyone have any recommendations of anyone better?