If you can't take criticism then you really don't want to post on here where people do tell it like it is and will judge you for your past especially when you have made more than one mistake of the same kind!
Surely you should have learnt from your first mistake and maybe employers will also think, 'hey we have a serial offender here' as many have here on your thread.
I was absolutely serious about brushing up on spelling and grammar as that is, in a written application, the very first thing an employer sees from his prospective employee and if you can't do that right, then there really is no hope for you with your criminal history. It may well be, for you, in your past, but for anyone reading this, it is definitely part of who you are and the same thing can be said of anyone who reads your CV.
Take voluntary work somewhere if you can get it (these jobs are also subject to CRB checks), offer your services free somewhere, anything that may prove yourself to those people you need to impress.
And get down off that high horse you seem to have stood upon, it really doesn't suit you