Rotorspin
Dont worry about it! I have the same problem, albeit in my right ear. I was granted a class 2 as you dont need a hearing test and when I took the initial for the class 1 I was given a deviation. The deviation will be lifted when I get the CPL so I dont see you should have any problems, if your hearing is particularily bad you will just not get the class 1, and I stand to be corrected on this point, but you wont lose your class 2. My advice is go for the class 1 and persue the career, the only thing you have to be aware of is your hearing getting worse than the renewal limits later on in your career and then losing the medical, oh and you can only train on UK registered a/c.
Hope that helps
C250