ThinkBroadband speed tester versus BT tester

I have recently moved to FTTC with Plusnet and the speed tests results I get from the above speed testers are confusing. With thinkbroadband I get about 12mb down 1mb up while the Bt shows 37mb down and 8 up, latency 24.5 which I take to be the correct reading. Why the discrepancy?
Alan Penn

Have a read through this thread from Sunday/Monday:

http://forums.thinkbroadband.com/fibre/f/4157515-thi...

I'm not saying it's an explanation, but I wouldn't worry about it.

Thanks for your reply. Tried THB tester using java instead of flash and got approx the same as bt.
Alan.