Hi Jane
If you leave a company pension scheme with less than two years of service in the scheme (which I presume you did, given that it is three jobs in five years) - then you are entitled to a refund of contributions.
However, that would involve forfeiting your right to employer's contribution paid for you.
Depending on the background to the funds...I presume they are all company pension schemes?...you should be able to transfer each of them into a single PRSA.
You may prefer this because you would then have one single pension to encompass all three of your former pensions.
However, you should factor in costs of moving from the three company schemes to one single PRSA (or buy-out bond) before making any decision.