For those with a BTS Nuduan Card be aware that some points will expire by the end of the Month. I checked mine and have to use 409 points by the end of the month, her indoors has 2193 points that expire March 31st 2012.

Yep, indeed the points expire at the end of the month, I took our two cards to the office at Siam BTS and exchanged our points for 900 Baht's worth of top-up vouchers, my good lady promptly lost her card with 700 Baht, well done chuck.

We did have a laugh about it though, at least the happy finder got a result.