Here is my script:
IO: Purpose of your visit?
Me: Visiting family.
IO: What family?
Me: My husband and his parents
IO: How long are you staying? Whats your husbands name? Address, phone, etc?
Me: (produce return ticket and tells him everything about husband)
IO: Where do you work? (why do they always go straight to this!??)
Me: Actually, I was just laid off about 10 days ago, but before that, I was working as such and such and so and so.
IO: Hmm. Are you planning on coming to live with your husband here in the UK?
Me: We are in the process of gathering the supporting documents for my visa and I plan on applying after returning to the states.
IO: Yeah right. Stupid American. Why should I believe that you will return to the US?
Me: I have a lot of things to take care of in the US before I can move - I need to sell my home, complete my dog's quarantine, find a home for one of my cats and, of course, complete the visa application process, which I know must be done from the United States.
IO: (impressed by my vast knowledge and certainty) You sure know your stuff. Welcome to the UK. *stamp stamp*
Sound plausible?

Beth, I hate it that we wont be in the UK at the same time!!! Booo!
David and I may be going down to Cornwall for a few days next week! I need some waterfront relaxation big time!