Congrats on getting your FLR, Ann. It is a big relief, isn't it?
Don't worry about after the 2 years...that part of the process is the easiest bit. You'll fill out a form, submit a few documents showing you and your hubby are still living togther (letters from the electric or phone company with both your names on them will do) with your passports and either go back to Croydon or send all your stuff in by post and they'll give you another stamp for indefinite leave to remain (ILR).
Once you have that stamp, you'll legally allowed to live here, work here, etc as long as you don't leave the country for an extended period of time.