Not sure on UK availability, I imagine they'd be bought online like US based customers.
The current game figure discussion has mostly covered a version of the Game Pack. There's also talk about the possibility of a Slime Blower if there's enough demand.
One of the lead designers has been posting over on GBFans, he's asked four questions he'd like people's opinions on, and I encourage you guys to stop by the topic:
GBFans: New Ghostbusters Figures Coming from Mattel in June He's also answering questions (as many as he can publically answer) about the figures. There was the suggestion that should the series sell out, that might be enough justification for the series to be released in shops. Mattel want this series to be a success.