A sequel to "The Biophysical Relationship Evolution", "The Biophysical Relationship Continuation" and "The Biophysical Relationship Development". Part 4, the day before departure. Everything belongs to Chuck Lorre and friends.

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The day before Sheldon and Bernadette departed for Cambridge Leonard and Penny hosted a farewell party. The whole social group was there as was Stuart and his wife Denise. All of Bernadette's research group was there as was Tom Kariuki and Jane Parker.

Leonard: "So is everything ready for tomorrow, is your house ready to be rented out?"

Sheldon: "Yes, everything is packed. The house is ready for guests, Caltech tell me that two visiting scientists from Australia will be living there for 4 months starting from the middle of April."

Leonard: "Do they have my name as a contact in case they have problems with how things work in your house."

Sheldon: "Yes they do, we are very grateful for all that you, Penny and Marie have done for us. How are the cats?"

Leonard: "Marie is having a wonderful time with them, I think we will have to get her a kitten when you come back."

Stuart: "Excuse me Leonard, may I have a word with Sheldon."

Sheldon: "Hello Stuart, how can I help?"

Stuart: "Cambridge has a Comic Book store called 'Tardis', it has lots of 'Doctor Who' merchandise that is difficult to get in the USA. Could you check it out for me and see if the merchandise is any good. If so I might try and import from them."

Sheldon: "I should be able to do that, good to know I will have a Comic Book store over there."

Stuart: "Thanks Sheldon, have a good trip."

In the mean time Tom Kariuki and Raj were sharing stories of their Cambridge days.

Raj: "Bernadette, you have been to Cambridge haven't you?"

Bernadette: "Yes, I went there 4 years ago when Sheldon attended a Physics conference, we had a great time there. We are both looking forward to returning. Thanks for making this possible Tom."

Kariuki: "You are welcome Bernadette. Where will you be staying?"

Bernadette: "They have arranged a visitors apartment for us at Wolfson College."

Kariuki: "My old college!"

Bernadette: "How long will my commute be to the Biochemistry department, it's going to be strange driving to work on the left hand side of the road."

Kariuki: "You won't need to drive! Wolfson to Biochemistry is 20 minutes by foot and 10 minutes by bicycle. I presume Sheldon will be at the Cavendish Laboratory with the Physicists.

Raj: "Thats where I studied"

Sheldon: "Yes, that's right."

Kariuki: "You will have a similar commute to Bernadette. Don't even try driving in Cambridge unless you have to, it was not designed for the motor car."

Then Leonard tapped his glass, he was about to make a speech.

Leonard: "My friends thank for all coming tonight to wish Professors Rostenkowski-Cooper and Cooper bon voyage, if you would like to raise your glasses as we make a toast to Bernadette and Sheldon."

Bernadette: "Thank you my friends, we are looking forward to the trip but we will miss you all whilst we are away. I would like to thank Jane and Andrea who will run my research group in my absence. Finally many congratulations to my former students Dr. Sanjay Chandrasekhar and Dr. Francesca O'Reilly on successfully defending their Ph.D theses. Good luck to them when they start their new jobs at Zangen next week."

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At the end of the party everyone else had left. Sheldon and Bernadette were saying their final goodbyes to Leonard and Penny. After a group hug Bernadette said "Thanks again for everything, see you all in 6 months."

Sheldon: "Where are the cats?"

Penny: "I think they are with Marie, come and look."

Penny carefully opened the door to her daughters bedroom where Marie was fast asleep with 2 cats on the bed with her.