Another, slightly cheaper (but more fun!) way to 50TPs. Courtesy of a post this morning on Raffles' blog:
1) Book this (
http://www.headforpoints.com/2016/01...usiness-class/) £92 one-way MAD-FRA, on LAN, in Business (787, long-haul flat bed business class, 40TPs)
2) Book two cheap ET one-ways on BA or IB (UK-MAD, FRA-UK) - about £40ish each, 5TPs each.
Et voile - 50TPs for around £170, and you get to try out the LAN long haul business seat.