Okay, this is fun.
I don’t earn that much so no actual experience or sums have gone i to this, but this is how I would imagine the lifestyle of a family on £150k in my area:
They have a large detached 4 bedroomed house. Either modern or newly refurbished. Spacious garden and drive space for 3 cars. Property is either secluded and private, or has a nice view.
They drive a large Volvo and medium size Toyota, which they bought from new and trade in every time the warranties runs out.
Not privately educated (no indy schools near me) but their children do all the hobbies: ballet, horseriding, rugby, theatre-school, instruments etc.
They have at least 2 holidays a year, one of which is renting a UK holiday cottage somewhere picturesque, and the other is abroad, like skiing in winter or summering in Southern France or Italy. Every alternative year or so, they do something really special, like a fortnight in Disneyworld Florida, or a December trip to see Father Christmas in Lapland.
They are members of things like the National Trust, local Zoo and subscribers of Which?, National Geographic, Aquila, and all the streaming services.
They don’t spend ostentatiously on day-to-day stuff (they often shop in Tesco, as well as M&S and John Lewis) which has enabled them to save very well. When their children go to university they will live off mum & dad and invest their student loan. The interest they will make on that will be added to the considerable deposit that their parents will give them for a starter home.
They own a labradoodle, a tortoise and have hens at the bottom of the garden.
Hope that answers your question 😁