Don't know if it's already been posted but I just got an OSF for £79.99 and it included a free £10 top-up, making the phone just £69.99 (that's the cheapest I've seen it). UPDATE: It now seems that some people are getting the phone for £74,99 - and the top-up making it £64,99!
I called Orange sales on 0800 801080 and gave them the number on the back of an old Orange sim card. The salesperson told me the phone was £109 but he could let me have it for £79.99 and the price included a free £10 top up (and free delivery).
Got the phone today, called Orange on 0800 079 0006, they took some details then told me the £10 will be added in 2-3 working days. UPDATE; Money is on the phone today - much quicker than they said it would take.
Just thought I'd let some fellow hukdealers know about this in case they are looking to buy this phone. Hope it helps.
p.s Sorry if this is a jumbled mess - first timer.