Simon,
I willl try to describe this accurately and will provde more detail if its helpful, but recently the forum has been giving me a popup on my phone. I have cleared the cashe, cookies and saved websites bit it still happens fairly often, at least once every 3 threads i click on. I will post a ss of the popup.
The reason i wonder if it may be a script of some sort on the forum is because it only happens here. No other website or forum i visit pops this up. If its something on my phone i will attack it that way, just inquiring of anyone else is having this issue with IOS based browers?