Provisional driving licence is also a good form of ID (costs £50 i think) I thought though that you had to get your FLR visa extension first before you can apply for National Insurance number, not sure what visa you will arrive on but it needs to allow you to work for them to allow you to get a national insurance number (Fiancee visa does not allow work) FLR visa does (thats what we did in our situation- arrived on fiancee visa, got married, then applied FLR visa, then got NI Number, and driving license - just helps with ID with address on it, then added to husbands bank account as joint names, apparently if husband has good credit history adding you also gives you a good start in credit history so they told us, soon I will look into English tests and all that crazy stuff!

Jaz