Across all parties, the number of MPs who own properties which they rent out is substantial. It has increased sharply since a change in the rules after the expenses scandal. Under the new system MPs can claim up to £20,100 for their second-home allowance but can no longer claim for mortgage payments — hence lots of MPs have rented out their constituency or (much more often) London home on which they were claiming for their mortgage and are instead renting another property on which they can still claim their second-home allowance. 

The number of MPs, however, who have registerable shareholdings is small. A few Conservative MPs not appearing on Beresford's list appear to be very wealthy — Jonathan Djanogly, MP for Huntington, springs to mind. There are others, such as George Osborne, who have a registerable shareholding in a family business and can expect to inherit more. The vast majority of Tories, however, have no individual shareholdings of over £66,396. This is certainly a change from earlier eras.

MPs' outside earnings have also fallen dramatically. Until the 1990s many MPs were employed by lobbying firms. Various scandals have all but killed off this source of income. MPs are also no longer routinely appointed to the boards of major companies. Some former top-flight ministers do pick up directorships and do well out of these, but they are not the norm.

It also used to be common for MPs to continue to pursue their careers from before entering parliament. A few still do. Jacob Rees-Mogg is paid £11,000 per month by the investment company he helped to found. Geoffrey Cox, Edward Garnier and Stephen Phillips still practise as QCs: the latter still derives substantial earnings from this.

They are, however, very much the exception, not the rule. A much more typical example of a lawyer's outside earnings are those of David Burrowes, MP for Enfield Southgate and the leading opponent of same-sex marriage, who was paid £400 as a criminal solicitor for being on police station call for 240 hours.

Even this is more than most Tory MPs report. The most common declaration for an MP's outside interest is fast becoming "nil".