Barkles,
In France, a Touraine Sauvignon will do the crisp fruity thing (Oddbins, Victoria Wine, Tesco, Sainsburys will invariably have up to a few) or a Muscadet in the 4-6 pound region - and, of a similar style with a bit more character, but harder to find, a Cheverny. A Sancerre or Pouilly Fume if you want to spend 7-10 (with wine specialists likely to have the edge over supermarkets on quality, though the supermarkets have improved immensely in last 2-3 years). In Italy, a Pinot Grigio will do the light and crisp (easier to guzzle!), though slightly less fruity.
On the light red side of things, in France, less expensive that doesn't taste poo comes from Loire in the guise of Chinon, Bourgueil (sp?), Anjou-Saumur and, further south-west of Bordeaux, there can be a good Bergerac lurking (though worth taking advice if poss)
Quick caveat - wine is obviously more a matter of personal taste - these are the ones I enjoy the most that suit the light, crisp, fruit white, and light red category that work for me. Hope that your wine choices are successful.