Been chatting to Gromr123 about the M4 closure, depending on where you are traveling from around the S/SW edge of London or further afield but that general direction, A3 through Guildford, A31 over the Hogs Back past Aldershot, A287 just before Farnham (not far between the two) to Hook, A339 to Newbury and on to the M4 might be an option. Bypasses Reading altogether. Potentially a massive detour but I'm always of the mentality that I'd rather be on the move than sat nose to arse in traffic. Hope this helps! It's the best route for us from Surrey that I can see anyway. We are setting off at 8am!