With the portable pension plan they take your age plus your years of service(your points) to determine whether you are in the 3%, 5%, 7%, or 9% category. For example to be in the 9% category you must have 75 points so a 50 year old with 25 years of accredited service qualifies to have 9% of his fiscal year gross put into his pension plan. If he grossed $50,000 then the company gives him $4500 for his pension. Plus every quarter 1% of his total pension balance is paid into his plan as interest. If he has $40,000 in the plan at the end of a fiscal year quarter he gets $400 in interest. And so on.
Here's the depressing part. Say a 3 year courier makes $35k. He's in the 3% category so he gets $1050 put into his plan. And the 1% interest that quarter would be $10.50. So you can see that for people starting out very little is contributed and it'll take many years for your account to build up into anything.
You can choose to take your portable pension as an annuity paying you monthly. You can take a cash lump sum. Or you can roll it over into another qualified plan like an IRA. You can even choose to leave it in the account to receive quarterly interest but I believe you must withdraw it at age 70. If you have a high paying job and work a long time you might get a decent payment out of it. But for couriers, who apparently the company only wants to work 5-10 years anyways, about the best you can hope for is use it to leave and live on for a short time while looking for other work, or if you've built it up past say $50k use it to pay bills, pay off the mortgage, buy a new car, something like that.