Another new job

Well, here is some exciting news. After I got offered the job in Newcastle-Under-Lyme I was relatively happy. However, Cap Gemini also offered me an interview and so I thought "Oh, what the heck" and went for it to see what they could offer me. And low and be-hold, I got the job! I am so much more happier now, as the job is based in up and coming Telford, and is a really good job. It is for a better company, so it will be challenging. It is for a software tester, and they offered me the same as Phones4u were going to offer me! How exciting. Now all I have to do is let Phones4u down gently. Any ideas on how I can approach this?