Some of the Primark lipsticks and nail varnish are very good - I was totally surprised at how good they are. I use a mixture of high end and high street make up, and yet I seem to reach for the 90pence lipstick from Primark everyday! The varnish is very good, lasts longer than my OPI.
Revolution make up have some good palettes. Might be slightly more than a fiver but they do a good set of blushers which would give you a selection. They also do some good highlighting products, some of which are a bit bling but there are some more subtle offerings. Boots Natural Collection has some really good blushes. I like Bourjois Radiance Reveal concealer or a Maybelline one. I have an expensive, much lauded Charlotte Tilbury one and I much prefer the cheaper Bourjois/Maybelline one.
When I am economising I use Nivea Soft as a face moisturiser and body lotion. It simplifies your life no end. Always on offer somewhere available in a big tub, smaller tub and a tube. Head and Shoulders do good shampoos and conditioners. (I used before Claudia advertised them and used them to make my hair shine rather than for dandruff.) Anne French cleanser is old school cleanser, but boy does it shift grime. And is cheap, try Savers. I use Decleor cleansers for the sensory pleasure (smell nice) when flush, but revert to AF when penny watching.
I also like the NSpa skincare range from Asda. They are often on offer. Particularly like the detox face scrub and the stuff that you put on to perk up your skin under makeup, or you can wear on its own.
There are no end of good products in the High Street that do the job over much expensive competitors.
Good old pot of Carmex for dry lips. Also useful to slightly change the colour and texture of a lip colour.