SimonG, what are the good things about FamilyRelatives.com?
I've recently been using them for the overseas returns of the UK BMD index (which they have available free), and was quite impressed. It did take a little getting used too, but after a few searches I found it quite a useful little place.
They also offers the 19th Century census returns (excluding 1881, and they also don't have 1901), as well as the complete BMD index to 2005 (which they also claim to be fully indexed for certain dates), the Great War dead, a number of military records (I'm not at all sure what these include...they just mention WW1 army & navy as well as WW2 navy, army & RAF), and a number of parish registers (they appear to be the Phillimore transcripts you sometimes get free with Family Tree Magazine).
The most attractive thing is they're currently running an special offer giving a price of only £37.50 for the year...half the cost of a year's subscription to Ancestry UK. For the average user, what they offer on FamilyRelatives seems to be quite reasonable...certainly for anyone just wanting census and BMD material, they are far more cost effective.