Alot of great replies and some very good points.
I am very lucky in the fact that 90% of High Street blazers that are of a slim fit look well on me as I have a 32inch waist and a 40inch chest so the taper down nicely.
I have been looking into places like eBay and online stores but I really hate buying something that I havent tried on.
I did that on TM Lewins with a suit and the cut was horrible so it has put me off.
But someone hit the nail on the head with thier comment about how it makes me feel and to be honest I am very comfortable inmy Zara blazers so I think I have found the answer to my question.
Many thanks guys!
This might be of help to you tho : Bespoke for men
I've recently had a fitting with them and ordered a pair of suit and shirt. Still waiting for the package.