From
FGW▸ Line problem at Wokingham.
Train services at Wokingham are being disrupted due to a problem with line-side equipment.Delays of up to 100 minutes can be expected.
South West Trains and Southern Trains accepting FGW tickets using any reasonable alternative route. Also London Underground will accept FGW tickets between Victoria and Paddington. Road transport alternatives being sourced.
Not sure what has happened. There was already Road Replacement between Reading and Wokingham because of engineering work. 100 minutes sounds bad news if you are heading for Gatwick Airport.