Update.
As @Greydog implied, I do have CCC and I’ve also found out that the 4:3 flip up screen was an option that may have only been available on the e82/e88.
I purchased a 2019 map update disc from eBay and so far so good, maps are very up to date, even has the Mersey Gateway (new Runcorn Bridge) on it. So this has fulfilled my needs, the car is only a weekend toy so I don’t need all the extras that a complete system upgrade to CIC or later would give, so I’m quite happy.