Add to the above a pair of waterproof socks for when the wet gets in.
I have some with Gore-Tex or similar that seem to work, but then my boots have GoreTex themselves so maybe not doing much or anything.
There are some available - no experience - that claim to keep your feet dry even standing in a bowl of water. IIRC Aldi had them recently.
Go search. I suggest you start with outdoor kit suppliers.
Also have spare socks sitting on the radiator at work waiting for you to arrive!
Until you find socks, howzabout a plastic bag over your sock?
ADD:- see here for Aldi item back in September. - and search for Dexshell waterproof socks in Google
Edited by steve27bha, 11 December 2017 - 08:51 pm.