Any regular iPad users in the London area?

Hi,
I wonder if any of your members can help. We're a small start-up 'social enterprise' based in West London building an FREE iPad app to help grandparents and grandchildren stay in more regular contact (through a safe and secure private network).

I'm not assuming everyone here is a grandparent, but you might know some tech-savvy friends who would be happy to do a bit of user testing for us.

The main thing is to test if the instructions are clear enough. Any help connecting with interested groups would be much appreciated.

Marc