Well just got back from the filming and wouldn't you know it, the God of Production was smiling down on me. All but one of the kids had parents drifting in and out, all perfectly happy to have the kiddywinks on camera. Even the mum who wasn't there gave verbal consent over the phone and has agreed to sign the release I'm sending her.
Now I just need to know whether I can use cutaways of the TV screen showing the computer games being played, or whether that breaches uk copyright. Anyone?