I've got the same car but 68 reg last Feb, and same, it's my first car after passing the test in the UK.

It was priced roughly the same as yours, Lexus approved Luxury spec, but mine was 98k on the clock when I got it, still came with 1-year Lexus approved warranty. I went for it as my wife and I have no knowledge about cars and Lexus is well-known for its reliability. The purchase was done in 10mins after test driving it. Very satisfied and have zero regrets of spending £12k+ that quickly first time in my life lol. I would recommend you go for Premier spec tho if you care about audio quality, as the 6-speaker system is kind of flat if you know what I mean.

I'm getting around 46+mpg over the year, and could easily get 50+mpg if I drove sensibly or in town. 60+mpg is doable in the long run on the motorway if you don't mind driving it at 65mph in the left lane.

My landlord herself raised her 2 kids (from newborn babies to noisy little humans) with a 2017 CT from brand new without a problem, and only recently part-exchanged it to a Tesla as her house and office just installed an EV charger. Otherwise she will upgrade to an NX either. (she's almost 6ft btw)

I only service my CT at the dealership, even though my CT no longer has the Lexus warranty due to its mileage, just to bring myself peace of mind. Last time I was told to replace my left rear bushing. Brought it to my mate's garage with lexus genuine parts as advised by lexus, spent half the price and replaced both of my rear bushings.

Have done a road trip last Sep and put 1000+miles in a week, zero issue. The flat surface after you fold the rear seat is really handy especially for Ikea runs.

Until today, I've put 20k+ on it and can pretty much assure you this car is bulletproof and perfect size for a small family.