First of all, there is nothing wrong with having multiple pensions.
If you transfer the benefits to your new scheme, it becomes part of the scheme. The accumulated years service also travels with you so the 2 year vesting rule will be satisfied.
If you die pre retirement, retained pensions ie the 3 separate ones are paid out as a lump sum. If transferred into new plan, you get a maximum lump sum of 4 times salary plus the value of your personal contributions. Anything over that has to be used to purchase an annuity.
You can access the 3 old ones from age 50 or draw them down at different times if you wish. If you transfer them in, you have to leave the pension scheme to access them early and as they are part of the scheme, they will be drawn down as one.
The lump sum is paid out on each individual contract as they mature. You don't take the lump sum for all of them from just one policy, too messy to administer. You are eligible to a lump sum from each of them. They will ask for your P45 from each employment if you mature them before retirement age, so keep them safe.
I would keep them separate, it gives you more options.
Steven
http://www.bluewaterfp.ie (www.bluewaterfp.ie)