John Hall wrote:

Looks like it was in 1999, with a CET of 15.6C. Before that, you have to
go back to 1961, with 15.2C.

Yes, that correspondes with the data I have here at Southend-on-Sea. The
winter of 1961/62 was a fairly mild affair.

--
Keith (Southend)

'Weather Home & Abroad'
http://www.southendweather.net