Welcome to FlyerTalk, Dianne Lambert, and please feel particularly welcome to the BAEC board. It's great to have new people here and hopefully you will tell us all about your future travels. If your username has a close relationship to your real name you may want to consider changing it.
If you have a wander around the Stickies you will find a lot of good information, including a particular one on the best WT+ seats. MMB should tell you what your aircraft type is, but I am going to guess that it will be a 777-200 series, with 3 classes rather than 4 (so no First). In which case seats in row 12, the front row, are often popular.