Tricky one.
What sort of law are you interested in doing? Top City firm, mid-range provincial, high street? Obviously your ambitions in that regard will affect how you should approach furter study.
My gut instinct would be to avoid doing a further three years of study. Why did you turn down the CPE course?
The graduate market is tough. There are more applicants than TCs and the standard of undergrad is high. The point in your favour is your experience in industry - you will need to play on that in interviews etc.
Apols - not much help. If you can give me a little more info, I might be able to give some more specific pointers.
Chalks