I'm so glad I bought those Upper Tier tickets during the presales rather than waiting to see if I could get anything better in the general sale. I now feel priveledged that we will be going at all.
Bad luck to those that missed out - surely they must be planning more dates.
Tried constantly from 09:30 (probably more like 09:15 actually) until I finally managed to get two seats in the upper tier (not offered anything in the lower tier).
Will try again tomorrow for the lower tier and then try to sell todays to recover my costs.