Gutted for you mate, hope your poorly bike is better soon bud. I'm sure for 2-3 weeks out they should give you a courtesy bike, especially if it has happened on other bikes in the range. Could you threaten to throw the keys back at them and get your money back?
I've heard rumors of this being a recall on K6 GSXR 600/750. Apparently they increasd the size of the oil drain in the head and it is causing stress fractures - new heads for all, at least you might get a prettier one this time!
hooray got it back today suzuki gb had parts in stock which i thought was a bit wierd?? it was the top cover of the engine in the end but fancy having something like that in stock!!!expecting problems were they??????some muppet gave me the wrong info which came as a bit of relief so repair wasn't as bad as i thought...phew