Saving for children, best way?

[Flickoffboris]

Hello, I've recently returned to work and am in a position to save for the dc, about £1000 a year each.
They have a sum in premium bonds, but due to infrequent wins that actually seems to be depreciating.
I'm wondering about a stocks and shares ISA, but I'm pretty clueless. I've heard that Fidelity are quite good, but have nothing to compare them with.
What sort of % return do you actually see on these things, no one seems to publish hard data?
I'm a lower rate tax payer as I work part time, would there be much drawback to keeping the ISA in my name, so they can't get their hands on it automatically when they become 18? I don't imagine I'll need my own ISA allowance any time soon as we are over paying the mortgage as our savings fund as and when there is spare money.
Thanks in advance for any advice, it's such an important thing to get right and I'm getting nowhere with the reading.

You will better speaking to an IFA than posting on here, they will have access to far more options than we can possibly know. They will also look at your situation, how long you want to save for, how risk averse you might be.

Thanks @hadalifeonce I wasn't being cheap, genuinely didn't think an IFA would be interested in talking about my few little quid, I've always assumed they were for people with lots more money.

No, anyone can use them. You would only normally pay anything if you use them. I am sure there must be an IFA web page to make sure you get a bona fide advisor.