red sores around ankles/over feet when doing above 12 miles

dear anyone.  Having a bit of  a mare training for 100km in that my feet come out in red hives when doing anything over 12 miles.  I do wear very lightweight boots and have tried a variety of socks but nothing seems to help.  I am now doing over this every weekend and having real difficulties.  My event is on 25th/26th May london2brighton, any advice?  Socks with wool, without wool etc?! I have spent a bomb on socks but can not seem to find any that do not cause the rash etc...any advice would be greatly received! 

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