Have you reached out to the London supporters club? They might be able to help, I was keen on going on Saturday and travelling by train but travel into Colchester is great due to rail works.
This is on their website cclsc.org.uk
Colchester (A), Saturday 14th November @ 3pm
Trains are affected by enginnering work for this one, meaning there is a replacement bus from Ingatestone (yes that is a real place) to Colchester.
Times are likely to be 1048 from Liverpool St, returning at 1812, with a journey time of around 80 minutes.
Tickets are £16.10