Want to trim your bills, update your home and do your bit for the planet? Sarah tests 'eco' products and sorts the fads from the finds. This week: mixer taps and condensing boilersThe weak euro may be bad luck for the Irish, but it's good news for overseas buyersA good local pub is becoming a must-have for many homebuyers, and can also put a village on the map. This week: vintage goes industrialJeff Howell gives on-the-level