I second the Worcester, they are good boilers i have fitted a few fs cdi's over the years and never had a problem.
What have the problems been with the one fitted?
Get your self a water softener its the only way to 100% stop lime scale, it comes with a cost but definitely worth it, take a look at the Tapworks softeners. I live near Reading and know how bad the water is, i have had my softener a few years now and would not live with out it.
After a years worth of pain from both wrists thanks to carrying heavy tool boxes i have invested in the Festool trolly, a couple of Systainers and the open tote as a burn bucket, it might of been expensive but for pain free wrists which was affecting my work its been worth every penny.
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