No problems with tap which is a mixer in kitchen, suddenly no hot water but cold water coming out OK. Could this be a build up of lime? And how can I fix it?

On this quite old (25 + yrs) mixer tap on the bath there is pull-up mechanism to divert the water to the shower and it is no longer working. Can it be replaced and if so how, or do I have to get a new mixer tap, as the young chap in the plumber's shop told me?

The lever to switch from water out of the shower head to out of the big tap has come away. The lever looks like it should be screwed in, but it won't go. Any ideas how to put it back together please?

Hi There, I Was Wondering If Anyone Know's How To Fix The Bathroom Mixer Tap. When You Turn It On, ( the hot water tap on the bath ) It Only Turns A Small Amount And The Water Comes Out Ever So Slow.. It HAS Been Doing That For A While now, But Now It Is gettind Bad. Its Very Slow. Can Anyone...