Thanks for the advice. I've been looking at the Eizo Colour Edge monitors - I like the idea of a built in sensor checking the calibration automatically (pretty sure I can't defend the extra cost of automated calibration - that's an extra few £100).
There are two monitors - one for about £720 which has an RGB gamut and is 1920x1200, the second £450 with an sRGB gamut and 1920x1080. There is also a gaming monitor FS233, which is supposed to have a very accurate sRGB pallete for about £280.
Any thoughts on whether a wider gamut is useful, or is the additional pain not worth it - my wife will also use the monitor and won't be pleased if she has to muck around with the colour palette to see her photos...
Colin