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That's fair enough but still best part of a tenner that may not be needed. Personally I would say to fully diagnose the problem before settling on a solution.

Do the pads make contact with the rotor within 10-15mm of lever travel?

I'll check tonight when I get in. Do you have any other checks I can try as well ?

Well, if the pads do meet the rotor within 10-15mm, continue to squeeze the lever further, and try and pedal with your hand to see the level of resistance. If the pads do meet the rotor within 10-15mm and you can still spin the wheel easily, then either the pad or rotor is contaminated, although it's likely to be both.

On the other hand, if the pads dont meet the rotor or barely bite the rotor after pulling the lever pretty much to the handlebar then the problem is something else. If this is the case report back and we can try provide a solution.

Before you put new pads in you will need to clean the rotors thoroughly. I took mine off the wheel, and cleaned them with cleaner 3 or 4 times using clean kitchen towel each time. I you have anything on the pad then it will be on the rotor as well.

I have done the test suggested here's the outcome.

The pads do bite when squeezing the leaver in 10 to 15mm and stop the wheel at a light push, when squeezing the leaver fully you can still move the wheel with a hard push there is resistance there though.

Any ideas ?

Sounds like air in the system still. Either they were bled correctly and you have a leaky seal somewhere or they weren't bled correctly. Did you try swapping over the pads?

I agree, a bit of air in makes it feel crap.

good bl;eeding is the key, i used to previously bleed my (Shimano Saint) brakes by squeezing tghe lever and catching the oil at the brake end, bu using a tube into a bucket, tightening the bleed nut between every squeeze. This worked fine but I too occasionally had problems, I then tried the syringe method, effectively sucking the oil through instead of pushing it from lever. This improved my brakes no end and now they feel great.

Burning them in is also recommended, but ideally you need a nice long steep hill and there arn't too many around here.

Andy