Are you sure about your figures? £140,000 in assets (vulgo: wealth) is really not very much.
Or did you perhaps mean to say annual income?
On the other hand, £140,000 in assets is consistent with your statement about that corresponding to "[...] what upper middle class used to be a nice house and a nest egg."
Based on data from the HMRC for 20042005, about 10% of all households in the U.K. had assets amounting to at least £176,221.
Regards,
“...Or did you perhaps mean to say...”
I pretty much said what I meant to say. Did you mean to do a better job of searching the web than you did before you question what I said?