LC series =
Subminiature Precision Snap-acting Switches, and there's a lot of information missing to get the same exact switch (check the downloadable catalog pages to see what I mean). Actual PN is on the long side, such as
LCS06A060P00WC (not sure of what you need exactly, just the only LC series I located on Newark).
Not seeing C&K offered on the UK site though (Farnell).
But if you figure out the actual PN, there's a competitor cross reference link page on C&K's site that could direct you to a suitable replacement you can get in the UK.
Convoluted, but if it gets your Dremel operational again, worth the effort IMHO.