Britons have been told to brace for 24 hours of heavy rain by the Met Office - just hours after two consecutive days of thunderstorms.

In a new yellow warning issued on Friday, almost all of Wales and the whole of southwest England are set for "potential disruption" throughout all of Sunday, September 22.

The Met Office says that the heavy rain could endanger driving conditions and public transport, and has warned of the likelihood of power cuts and flooding - the latter of which could cut off some rural communities for a time.

The rain is set to lash the country after a pair of yellow thunderstorm warnings - from midday to 8pm on Friday, and from 1am to midnight on Saturday.

The rain is set to lash the country after a pair of yellow thunderstorm warnings

The storms will contribute to the downpours, with the Met Office detailing how showers and thunderstorms are expected to merge into broader areas of heavy rain on Sunday.

Across the impacted regions, some areas can expect 30-50 mm in fewer than six hours, with a few places receiving 60-80mm over the course of the day.

In the South West, locals have been told to prepare for some heavy rain during the early hours of Sunday morning, which will break up into slow-moving, heavy - and, in places, thundery - downpours during the daytime.

Meanwhile, the areas of heavy rain are likely to continue pushing north and west, the Met Office says, becoming slow-moving across some northern and possibly eastern reaches of the warning area during the rest of Sunday.

Showers and thunderstorms are expected to merge into broader areas of heavy rain on Sunday

Britons have been told to prepare for some heavy rain during the early hours of Sunday morning

Looking further afield, meteorologists have predicted mostly dry and cloudy conditions with sunny spells across the north of England and Scotland on Sunday.

Then throughout the coming week, the South East can expect more rain - but "lighter and not as extensive as previous days", the Met Office says.

Elsewhere, Britons can expect "generally settled conditions" in much of the country - though a band of cloud and rain is set to make its way across the far north, particularly the northwest, while a few showers move into the southwest.