Just bought a replacement rain sensor unit to replace my old Maplins unit(circa 10 years old) which has suffered the ultra violet rays and I manage to break one of the fastening tabs!!
. It seems they have changed the moulding and added a higher side wall to it. It is the same depth (20mm ) as I was creating from an old grape package from Tescos to fit when it arrived. It also has a very small bubble leveller (on left side on picture) which with my eye sight I doubt I will be able to read!!
Now where did I store those bird dissuader wires!!