The Amex to Sirius deal is pretty good if you redeem for meals at their hotels. You can get about 1p per point with the UK scheme.
Ran the numbers here
http://www.headforpoints.com/2013/04...-1p-per-point/
I need to think about whether I should do a big transfer to cover a holiday next year or not. Risky to be stuck with them due to the expiry policy.