G-V I guess you hit the nail.
After taking on board what has been said here is what I have decided.
The 70-200 has been offered to me for £900, which I didn't have.
I have sold a 70-300 IS (non L), a Sigma 17-70 OS HSM (mki), I am going to also sell the 17-55 because it will generate the balance of my needs. After purchasing the 70-200 I will sell the 50mm 1.4 and then replace the 17-55.
In photography I guess Macro is probably actually my first love, it's something I do at least 3 or 4 times a week.
I very rarely use the 50mm, it seems to get used out of guilt hehe.
I thank you all for replying as it has helped me to decide that I do need the 17-55, and along with the 100L and the 70-200 2.8 I would have a complimentary range of lenses.