Just watching the met office rainfall radar and you can see some pretty vivid returns on it down in Cornwall.
The Met Office did issue a warning last night at 22.32:
Local areas affected Warning type Valid from Valid to
South West England:
Cornwall & Isles of Scilly
Devon
Plymouth
Torbay
Heavy Rain 0400 Wed 17 1300 Wed 17
Persistent heavy rain on Wednesday will give accumulations of 30 mm or more quite widely with 50 mm or more locally on the slopes of south Devon and Cornwall.
The public are advised to take extra care and refer to the latest Environment Agency, Floodline, and Flood Warnings in force, and to refer to the Highways Agency for further advice regarding traffic disruption on motorways and trunk roads.
Issued at: 2232 Tue 16 Nov
Sounds like it was too late though.