Nobs
Another simple search technique is to do a search on your database for prospects with titles or suffixes which can be an indicator of wealth or influence.
Titles Duke, Marquess, Earl, Viscount, Hon, Dame, Lady, Baroness, etc.
Suffixes QC, Bt, Bart, JP, DL, etc.
A title by itself is no guarantee of wealth or influence, of course, especially in this day and age; a search for those with the prefix Lord or Sir could bring up a very mixed bag of people, to say the least. But there may be some nuggets of gold amongst the silt.
A search of hereditary titles can bring to light people who may not be wealthy, but who could be very well connected. Useful if you are looking for influencers as well as wealthy prospects; even in this modern age, a title still impresses and attracts a fair number of people.
Jobs
Do a search in your database for senior job titles: chief executive, chairman, director, trustee, president, founder, etc.
As with the previous search, this can bring up a mixed bag of prospects, but there may be a few wealthy or influential people in the list.
Emails
Do a search on your database for all those with an email address. Paste the resulting list into a spreadsheet and then sort them by domain name to identify those who may be of use to you; e.g. company domains, NGOs or those in national or local government for example.
To sort the list by domain name, perfom a 'find and replace' action on the list (Ctrl F). You want to find *@ and replace it with nothing. This will turn list A into list B, which can then be sorted alphabetically for easier searching:
List A
God@heaven.com
Pat@royalmail.co.uk
Mat@researchspod.com
Bill@flowerpot.com
Tony.blair@number10.gov.org
David.Cameron@tonyclone.com
Ben@flowerpot.com
List B
heaven.com
royalmail.co.uk
researchspod.com
flowerpot.com
number10.gov.org
tonyclone.com
flowerpot.com
All three types of search will produce lists that require further research to actually determine the wealth of the prospects, but they are a good starting point.