If your FUSIBLE THERMAL LINK has gone, it will cost around £16.25 for a replacementfrom this website
www.spares2go.co.uk/browse-CREDA-79151-FUSIBLE_THERMAL_LINK-m121-p6431-s12125.htm. If I were you, I would think about changing your heaters for modern Creda TSR, they give out more heat for a longer period, and havent got those expensive fuse links. I have these, you just set and forget, simples eh
Homer, December 2010