I see on Saturday that GN aren't going to run anything north of Cambridge after the 1805 to Kings Lynn, whereas XC and GA are running effectively a normal service.
I was rather hoping to have a trip to London on Saturday, as for most of the last three months we've had engineering work blocking both Cambridge-London lines all weekend every weekend, but with only two trains scheduled to run between Cambridge and Ely after 2030 (both GA Norwich trains), I expect there is a serious risk of them being so overcrowded I may not actually be able to get home, so I'll probably not bother travelling at all.
Another great performance from GN.