While I am normally not a fan of buying miles (kind of defeats the purpose of free travel from everyday activities), in this case you may want to top up your account to book an award before the 22 March devaluation.

Here’s the offer, be sure to read the T&Cs.  It’s probably the best price you will get and may be worth it if your desired award will be increasing quite a bit and you don’t have time to get the miles any other way.

Old chart which expires 22 March 2016

Horrendous new chart