Another thing to consider is that the quoted temperature of 34.8°C at Charterhall is probably only the highest hourly reading for that station which helps to explain why it is only provisional just now.
It is only when the 18z SYNOP data comes in that we will know what today's actual maximum temperature was there and that applies elsewhere in the UK as well including those stations where the temperature has gone above 40°C.
This means that any record which has already been provisionally announced is likely to be officially declared with even higher values being confirmed for those records.
For here in Scotland, this means that we can't rule out the possibility of the new record actually being over 35°C once those actual maximum temperatures are known.
Originally Posted by: johncs2016