Parts of the UK are at risk of surface water flooding after “heavy and persistent” rainfall at the end of last week, the Environment Agency said today, including some areas of London, East and West Sussex, Surrey and Kent.

Flooding has been reported in many places overnight with some areas seeing between 30-50mm of rainfall since yesterday evening.

The heaviest rainfall was in Wales last week with 102mm (4in) of rain falling at Trawscoed near Aberystwyth between Thursday and Saturday.

Flood-stricked Wales appears to have avoided power outages despite the heavy rain. Western Power which covers parts of the country said it had “some problems” on Friday which are now cleared up.

ScottishPower ManWeb which covers the north of Wales told ELN it had “no major incidents” except for one substation in Mechynlleth flooding which affected 2-300 customers for a short period of time on Saturday morning. It said the problem has been resolved.

Energy firm SSE said there has been little effect on their operations.

The Met Office is predicting “generally unsettled” weather for the rest of the week with “persistent and heavy rain” from Thursday even into the weekend, especially for the southern parts of the UK.

There are 36 flood alerts for rivers across the country, meaning flooding is possible although currently, there are no flood warnings for rivers which generally means that flooding is expected.

The public are being strongly advised to stay away from swollen rivers and not to drive through floodwater.