Hi Keith - unlikely you'd get EMA straight away, or anything in the UK for that matter. You stand a chance after a year although it's a bit of a lottery. STN after a year would be more likely.
Yes, you could park at EMA or STN but at STN at least you need an STN ID and can then get car parking. Not sure of the process for EMA but would suspect it's the same. As with most things in Ryanair though, you'd have to pay.