Bob Martin wrote:

When did England last get to the end of March without reaching 20 degrees?

My childhood memories (i.e. pre-recent warming) are that this milestone was reached somewhere in the UK (OK, it probably usually was England) around the middle of April. We should not expect 20C in March - and UK temps have been well up to long term averages this month. The record March temperature of 25.6C is going to be approached very closely in the next few days.

Julian
Molesey, Surrey.