MP: Thank you for relaying your tale of woe, it takes a brave man who admits his faults so publicly. Seems to me the tone of your original post wasn't at all "sorrowful" as Bose-X describes, but honest and forthright.
As for the fine and court costs, I agree with EnglishAl, I think it would have been far more productive for them to have mandated further training and possibly revoked your FI rating or reduced privileges until this had been done.
Other than short term financial hardship, I don't think the fine serves any purpose. Given that you admitted fault/guilt unconditionally to the CAA at first interview they could have avoided the costs of preparing and prosecuting the case; and arguably improved safety as well.
Safe flying.