There is some serious wealth inequality in the UK so it is fairly understandable. The sort of house he perhaps bought for 500k in the midlands, assuming a nice-ish area could well be a very ordinary family home with say 4 bedrooms (one of which might only be a small guest room/study), lounge, dining room, kitchen and double garage... maybe a conservatory at the back and a modest garden (or tiny garden if a relatively new build).
While in terms of income he's up there near the top, in terms of wealth/assets he's still pretty average as there are an entire generation of boomers + plenty of Gen X who accumulated similar or bigger assets while not having to be anywhere near as high in terms of income percentiles at the time.
Indeed, earnings and wealth are two different lists and there may be crossovers but an awful lot are separate.
In order to be in the top 1% "wealthiest" you need a net worth of £688,288. I would imagine there is a huge proportion of mortgage free boomers living in the south in that 1%. So even though I am in the top 2% earners and as a household we are in the top 1% earners, I dont even make the top 1% wealthiest, I'm probably only just in the top 5%
Top 1% £688,228 21% of total UK wealth
2% £460,179 28% of total UK wealth
5% £270,164 40% of total UK wealth
10% £176,221 53% of total UK wealth
25% £76,098 72% of total UK wealth
50% £35,807 93% of total UK wealth