this is a little update:
I went here (Rock and Sole Plaice, 57 Endell Street,London) on staurday afternoon, around 2pm and thec rowds were just beginning. The sun was out so many of the punters weres itting outside (they got a large number of tables, you can drink booze out there as well, but you gotsta buy food..and fair enough:beer £2.50 per bottle, wine £8 cheapest bottle)
I shared a large Haddock n chips and for £9 it was a tad pricey, but worth it. My girlfrind and I got one portion, two (40p) bread rolls, two beers and just sat and ate fish and chip butties til we got bored and left. Best batter I've had in london and the chips were ace.
Don't go to dine: just head there if your near covent garden to get a little snackette or late lunch.