Old money vs new money in layman’s terms
I'd sat it goes even further.
Aristocracy and old money, of course. However in Britain there are also families that have been middle class for generations - many since the 1800s.
I think there is a difference between even those families and upwardly mobile of the last few decades.
While the former would never see themselves as other than middle class - they are privately educated as a rule (however, not usually at the top Old Boys institutions), have homes abroad, pass down their assets consistently to new generations and have their own social habits. For example, this group tends to socialise around events like Cricket/Tennis/Rugby and opt for homes in Northern Italy (Tuscany most often) and Southern France. Either working in law, accountancy, civil service or long held family firms. They're the type today for whom attending something like Royal Ascot would be strange (that's either for the old elite or working classes performing 'cosplay'), would never attend a football match (dont follow the sport or gel with the crowd) - and consider certain European holiday destinations firmly out of bounds because they attract the 'wrong kind' of Brit. However, they may not necessarily blindly align with Tory policy or values - and consider, for example, subjects like the NHS, Welfare System and State Education with less inherent bias than you'd imagine.
They also tend to be comfortable being more openly critical of the monarchy.