Let’s look at this realistically. If you’re an expat in Spain, for example, and the UK leaves the EU do you really think that your UK-based pension provider will be unable to make a payment to you now that the two countries are not joined by the EU?
Is this not already the case for the thousands of British expats who have made their homes in countries such as Canada, South Africa, Australia or Timbuktu (which is in Mali if you’re wondering) who currently receive their pensions without any fuss?
There are many unknowns around Brexit, but the political risk to your pension is minimal.
There may be investment risk to consider as Brexit rocks the boat and has an impact on markets and currencies but this is not connected to whether your pension is in the UK or Malta but more how it is being managed.