Don't know if the S and G one has been discontinued. I'm very pale and like the palest shade of Bourgeois 123 Perfect. To me it compares well to some of the high end foundations but is only £10.99 and often on 3 for 2.
revlon colourstay is worth a look, especially the whipped if you can get it. I use the ivory shade in the whipped and it's very pale, finally something pale enough for me. otherwise i use Estee Lauder double wear light in intensity 0.5 but thats a bit over your budget at 28