Sainsbury's biological powder is very good, costs £2.50 for a 20 wash box and it work wonders! Morrisons bio is great as well, cheaper but is the same stuff since they're all made by McBride, and the only difference is the brand name on the box, the size and the price.
Sainsbury's and M&S fabric conditioners are very nice. M&S do an Ocean Fresh variety which smells gorgeous and Sainsbury's Clear Skies could easily rival established brands. Asda fabric conditioners have been revamped and are £2 for 70 washes, the Star Fruit one is really nice as well as the Cotton Fresh one.
It's so nice to use cost effective detergents and have them be just as good as the big brands, except the finished product has not been tested on animals, nor have any of the ingredients and they haven't been derived from animals which is great.