Piggy's range in price from $100-600 depending on the condition of the pony and which pony it is, since some are more sought after and others are harder to find.
Frestia is harder to find and your pony is a nice example, so I'd suggest a price starting of $500 for her
You might want to take some pictures of her symbols as there are three variants of her, each with different symbols including: white strawberries, red strawberries and red apples. This may well be an important factor to a potential buyer
plus the more picture the better, especially with a speedy item.
There are collectors in the UK and they might well be interested in her so yes there is a UK market. Piggy ponies are quite a niche item and so don't have the same mass appeal; there just might not be anyone in the UK who wants her or enough competition for her to reach her "market value" via an auction (at the end of the day "value" is only what someone is willing to pay) So, to get the "best deal" for yourself you might be best to open your sales world wide.
If you do plan on selling her here rather than eBay, please read the MLParena selling rules (link below)
http://mlparena.com/index.php/topic,365632.0.htmlLove pkw xxx