I did it! After 2 days of conscious hydration my legs were back to normal, no more concrete shoes, and I found my rhythm without too much trouble.
Could have done without being yelled at from a passing van 5 minutes in, but I just kept going and soon was at the finish line! Last 2 minutes were the hardest, but I am soo pleased to be back here! Now I get to wear my new ‘week 5 reward’ trousers for the next run too!