Staying clear, dry and mild tonight.
The Met Office has issued an amber warning for rain in the capital, with torrential downpours expected across the south east of England.
A lightning bolt struck a TV aerial attached to a chimney stack. It dislodged a brick that crashed through the conservatory.
Neighbours say they saw a "fireball" and sound like a "bomb exploding" during the lightning strikes in Streatham.
Rain warning for Saturday increased to 'Amber'. Some London areas could see 100mm (4') as well as thunder, lightning and possible flooding.
The roof of a house in south-west London has been badly damaged by a "big red ball of lightning" following heavy storms.
A neighbour witness described a ball of fire that was said to have caused an explosion "like a bomb going off".
Fire investigation teams are now at the scene, ITV News' Jim Dutton reports.
London! Lightning! http://t.co/gyqo0d9zxc