Rain delays?

Depends how deep the tracks were flooded, how much signalling equipment was damaged, stations escalators, lifts, trains stranded etc. I would expect Monday 26 July 2021 will be a day to look on the TfL website to see how the service is affected.

Seems we fared considerably better than the storms of 12 July, with no Line closures this morning and only Stepney Green closed because of overnight flooding.

There was also District suspended Earl's Court-Embankment and Earl's Court-Edgware Road (flooding affecting equipment at Gloucester Road)- problems were still occurring on Friday 16 July
Circle H&C were suspended after an eastbound train went into deep floodwater in Royal Oak dip, train not recovered until Tuesday 13 July.
Flooding in tunnels around Baker Street also added to that.
Barons Court, Bond Street, Cannon Street, Chalk Farm, Earl's Court, Edgware Road (both), Golders Green, Hampstead, High Street Kensington, Holland Park, Kilburn Park, Marble Arch, Marylebone, Notting Hill Gate, Regent's Park, Sloane Square, South Kensington - stations were all closed at the height of the storm on 12 July.

We had a terrific monsoon-style downpour yesterday, it came in two tranches, with much lightening and thunder too.

With reference to the problems in the Woodfoord area, road traffic reports said that parts of the North Circular Road (which the Central line crosses in this area) were closed, plus the A1400 Woodford Avenue.

I do not know if Redbridge station was affected but the A406 and A12 directly above it were also inundated and had to be partially closed - a very dramatic move!

Newbury Park station does not normally flood but when there is heavy rain the passageways below the A12 Eastern Avenue which allow people from the southern side of the road to reach the station sometimes become inundated.

The road outside my house was flooded, something like 6 inches deep. Some of my neighbours were beyond panic stricken because water was lapping on their front door steps and when cars passed by the wash they created saw water entering their houses.

But it was not all bad ... I did not need to water the garden!

London's problems pale in to significance compared to what happened in one Chinese city where several metro trains were stranded in flooded tunnels and there is footage online showing people calmly awaiting rescue whilst standing in water chest high. These were the lucky ones, because they were indeed rescued - led to safety on emergency walkways alongside the tracks. Also seen (through the train windows) was water rushing past the train and water cascading down stairways - viewed from what were probably inside ticket halls just below ground. This location had a year's worth of rain in mere days.

I passed over the A406 just north of South Woodford station twice yesterday. first time around 17:45 it was severely flooded, closed both directions with a car half submerged in the anti-clockwise direction, second time around 19:00 they'd opened it clockwise towards Ilford, still closed in the other direction and the car had gone.