James:
The previous posters are correct, that the greens on the first two courses have been allowed to transition to Poa annua, while Old Macdonald is still almost 100% fescue. Part of that is age, but part is also management. I won't say the greens at Old Mac will never become dominated by Poa, but I think it will take a few years longer, because Ken Nice and his crew have learned as they go.
We never expected 100% fescue to last forever ... our only goal was to have a firm and fast and good playing surface, and starting with fescue has helped to set a high bar in that regard.
As to your question about green speeds, though I haven't played as much in the UK as of late, the greens at Bandon are consistently faster than the average greens in the UK. I think Sven is right that Bandon's greens run around 10 on the Stimpmeter [though they vary with weather and seasonally]. There's no way the average UK course is 10 on the Stimpmeter. Maybe the big championship sites where they collect big visitor fees, but not North Berwick and Cruden Bay and Dornoch and the rest of the tourist trail.