Thanks Swiss Tony. Looking on the ITA Software site there's scope for 9 weeks from 11/10 - 15/12 or 8 weeks on 25/10 - 23/12. Expedia et all aren't giving me those prices so I assume I'll have to book over the phone with BA and give them an extra £15. Must get this sorted soon methinks or there will be nothing left!

Now only if I could find some Ashes tickets!