You asked
Do you have any information on how many British people choose to get married abroad rather than the UK?
We said
Thank you for your enquiry.
We produce statistics on marriages in England and Wales; https://www.ons.gov.uk/peoplepopulationandcommunity/birthsdeathsandmarriages/marriagecohabitationandcivilpartnerships/bulletins/marriagesinenglandandwalesprovisional/2016#links-to-related-statistics
Data on marriages in Scotland and Northern Ireland are the responsibility of National Records Scotland (https://www.nrscotland.gov.uk/statistics-and-data) and the NI Statistics and Research Agency (https://www.nisra.gov.uk/statistics).
Unfortunately we do not collect any data on marriages taking place outside the UK. While marital status is collected as part of some statistics, such as registration of births and deaths, the place of marriage is not collected.