In message ,
Peter Nockles writes
On Monday, March 5, 2018 at 6:47:49 PM UTC, wrote:
Some googling suggests it was the 28 March 1975. So that seems to be
the answer. Thanks Norman. I too recalled it as April. Memory getting
hazy.

I have a vivid memory (and indeed photos to show) that there was a
significant snowfall at least in south London on Good Friday 1978 -
there was about 4 to 6 inches lying in Wallington (where we lived) and
Coulsdon (where we stopped for photos) Surrey, on that day (I am sure
that Ian Currie could confirm!). I am not sure if this was the same
event or not. Peter Nockles

Living in Cranleigh, I remember the snow on Good Friday, 1975. We had
about two inches, the only lying snow we had during what was a very mild
winter, but it all melted within two or three hours. I don't remember
any snow here on Good Friday, 1978.

Of the 1975 event, Trevor Harley's excellent website says:

"Famous snowy Easter. There was 15 cm of snowfall in Birmingham on
Maundy Thursday, and the whole holiday saw snow cover."

Of 1978, he says of March:

"An unexciting month: slightly milder than average (6.7). Easter was
windy and thundery." He does say of April that "Snow fell in places on
the night of the 10-11th", and I wonder if it could be that event that
you are thinking of.
--
John Hall
"Hegel was right when he said that we learn from history
that man can never learn anything from history."
George Bernard Shaw (1856-1950)