1. escrow are just a payment source nothing to do with domains,you can buy domains anywhere and most people accept escrow as payment
2. parking is a waste of time,just build a mini site(around five pages)
3.if the domain is a u.k domain then you could ask for an appraisel on this site it is the biggest domain site in the u.k and you will roughly know the value.
4.i would get to grip with the domain game before trying to auction domains off,walk before you can run
5.yes you can buy the co.uk domains
tip. try not to ask questions in other peoples threads,it is annoying and disrespectful.
mark