On Sunday 8 October the Elizabeth Line will not be running east of Ealing Broadway until 0745 (use the Central Line from Ealing Broadway before that time) and for the rest of the day not East of Paddington (so not through Central London, or to Shenfield or Abbey Wood).
Use alternative tube or rail services for onward travel from Paddington.
Liverpool Street to Shenfield trains for all operators are replaced by buses from Newbury Park (Central Line) for stations beyond Stratford. For East Anglian destinations the buses run from Newbury Park to Witham.
Also the last train from Heathrow Terminal 5 on Saturday 7 October (0007 on Sunday morning) terminates at Ealing Broadway, not Paddington. Use the night tube or night buses into Central London.