LeninGregg - you're right, of course! I was just chatting to DH about it, and agreed we need to think about what we want to save for ourselves and then what we want to save for DS. It's about getting the most out of what you have, really, I guess.
The attraction to me of the pension option is that, because you'd be investing over such a very long term, I read that paying in a relatively small amount (£80) per month from 0-18, could generate a pension pot of £4m by age 60. I don't know the basis of those figures (read them in Prima magazine ), before anybody jumps on me!
And I know that my MIL has to pay in about half her salary now towards her pension as she lost out by getting divorced 20 years ago and having a big break in employment while raising kids.
So you could do what one of the other posters has done and pay in the child benefit (if you can afford to), or the DC will need to pay much higher monthly payments once they start work. So I think it is a wise investment choice if you have the cash spare.
But we're planning to talk to an IFA (rather than basing our financial futures on something I read in Prima )