After looking on the page on FT which explained everything about TA MFU's (forgot to copy the link) it does specify that bulk tickets cannot be MFU. This has just given me a reason not to ever, ever book again through Netflights.com. I have just bought a reward ticket for the same flight in CW and will try to get my taxes back from the last leg on my original WT+ ticket. Pretty p***d about netflights!