Ryanair / Passport Name

Booked flight to Spain using name Andy instead of Andrew which appears on passport. Will I have to change this and at what cost ??

You will probably be ok. I once accidentally clicked Latvia instead of Ireland for my passport country using the on-line check-in with ryanair which is a much bigger error. I was expecting the worst but never got any additional charge for it, they didn't even notice.

Have travelled before on similiar shortened name and had no problem

Thanks for responding - look like it will be ok especially with online check in.