It has been exceptionally mild this year and due to our early spring and late mild weather some places in my garden are on their third crops of the year!
This in turn means the cool weather crops are struggling, I've even had Boltardy bolting and I've grown it for 20 years now and never seen that before..
Then we now have had no sun to ripen the crops which have formed although the toms did get there eventually.
I also think some of the seed which was saved last year was not of the best quality due to the issues caused by the extreme heat.
A lot of growers had problems this year with really poor germination and rotting tubers/sets etc.