Peaked 34.7c at 14:06 now cloud arriving radar showing rain in the area 

Ogimet and then choose “latest METARs” or “latest synop reports” 

https://www.ogimet.com/ultimos_synops2.php?lang=en&estado=United+K&fmt=html&Send=Send

Cheers bud! 

Reading University which is an official site reached 34.0C at 1348

So it did! Down a degree now.

http://www.met.reading.ac.uk/weatherdata/Reading_AWS_weather_report.html

Imagine if the Downs had any serious height.

A humidex of 40C in London.

Yes, I've often thought it would be fascinating to model the impact on SE climate if the Chilterns, North and South downs were 3 or 4 times their current height. Parts of Kent and Essex would be practically a rain shadow desert particularly in winter, and we'd get some nice foehn effects with humid plumes in summer.

Looking at that Reading link yesterday’s max of 34.6 came at the very late time of 1637Z, ie 5.37pm BST.

I think the Berks/Hants/Wilts area seems to be the centre of the heat today.

Edit: 34.5 now reached at Reading. 

34.6C at St James's Park highest (Met Office Twitter)

6 consecutive days of 34C and above since 1961

New date record

Yay! we've hit 30c!

Is that the same Whiteknights site that the Met use? The max recorded yesterday there is 34.6 but the official Met Office list of maxima for yesterday has 35.0:

Boscombe Down 33.0°C,  Kenley 33.2°C,  Larkhill 33.6°C,  Middle Wallop 33.9°C,  Farnborough 34.5°C,  Odiham and Farnham (Alice Holt Lodge) 34.6°C,  London St James’s Park 34.8°C,  Reading University 35.0°C,  Northolt 35.2°C,  Wisley 35.4°C,  Heathrow 35.7°C.

Incidentally it’s very rare for Odiham or Alice Holt to go higher than Farnborough in summer as they are more rural sites, but both were higher yesterday. 

Shot up to 35.5c here. Something building just to my north too.

Here it’s fallen sharply to 32.5, from a high of 33.7

Big storm clouds here now almost out of nowhere and the rumble of thunder.

I know from years of experience that when clouds are exactly above your house but not shadowed, the temps rise quicker and stop when cloud moved away with clear skies above or get shaded.  Here was 30C for a while then some clouds went over my house and temps rose to 32.6C the highest so far.   I always know that nearby or above clouds does tend to trap the heat.   I am sure many of you notice the temps rise well when cloud above you.

Heathrow 35.3c