Looking at the highest recorded maxima for the UK for each date on the
TORRO website, I notice that the record for the 13th June (Tuesday) is a
relatively low 28.3°C, set in 1896 and equalled in both 1948 and 1994. I
would have thought that particular record might have a reasonable chance of
being broken this coming Tuesday.

I've also been wondering whether that is the latest date on which 30°C has
not been reached - if so, it's at least conceivable that record could fall
as well - but the TORRO site seems to be unavailable at the moment (and
that particular page isn't cached by Google) so I haven't been able to
check.

--
Bewdley, Worcs. ~90m asl.