With temperatures in Britain soaring, sunseekers have caused traffic chaos on routes to seaside resorts and tourist centres
Weathermen have predicted the hottest weekend of the year so far.
Large swathes of the country basked in temperatures between 27C (81F) and 30C (86F).
Highs of 31C (88F) hit England's capital London on Saturday.
That could rise to 32C (90F) before the hot spell is likely to break around Wednesday.
The popular pebbled beach resort of Brighton on the South coast attracted hundreds of sun worshippers who were glad to cool off in the usually cold waters of the English channel.
Only northeastern England and eastern Scotland were missing out on the heatwave, with temperatures there more than 10C lower than in the rest of the country.
Rising humidity also meant there was a possibility of isolated thunderstorms.
Roads out of the major conurbations and towards the coast were generally busy with severe problems in the south west.
Huge tailbacks built up on the M5 as daytrippers and sun-seekers headed for Somerset, Devon and Cornwall.
The combination of heavy traffic and humidity increased levels of pollution enough for the Government to issue smog warnings as levels of ozone and particulate matter began to rise.
Asthma sufferers in particular could notice "significant effects" from air pollution and have been advised to reduce time spent outdoors.
"If they have a respiratory disease like asthma they may find that their symptoms are getting worse. That is they will be getting more sneezing, sometimes breathlessness difficulty in sleeping they may find that they have to use their inhalers a lot more "
SUPERCAPTION: Doctor Francis Cunningham
Visitors to London were warned to avoid the midday sun and drink plenty of fluids to avoid dehydration.