Just came back from Brighton to Worthing on the 27 and it was thick with them, at 70mph they don't have a chance, regretting a white car now. Almost picked up an obligatory dopey Seagull in the middle of the road feeding on them too. Expect quite a few grew smudges on local roads for the next day or two.
None in Lewes when I left work, but back at London Road Stn there's loads of giant wingless ones. The seagulls are wandering about snacking, they're loving it and it's keeping them quiet for a bit