Hi all
Thanks to respondents in Part (1). Dismantled toaster last night and it appears that the hold down mechanism in our Russel Hobbs toaster is provided by an electro magnet. This is anchored to the base of the unit. Travelling with the slider arrangement is a plastic dangling carrier with the metal counterpart. Both appeared clean enough to work OK. Cleaned all the internal crud out - not too bad and no nasties like mice etc!
Reassembled toaster and tried.............just the same...........latch works occasionally when it wants.
So, guess it's landfill time and a trip to wholesalers :(
Phil