Not really a winter wonderland but we used to attend the Candlelight evenings in December at Lord Lichfields house (Shugborough Hall), had tours around the house and quarters, food, stalls, reindeer etc. That was amazing, very festive but the last 2 years they've moved to a day time event and its really not the same.
Last year we attended a Winter Wonderland at a race course (think it was Chester) a it was a mixed experience. £4.50 for a basic hot dog or burger, and we're talking the same as the £2.50 ones from the local van. Rides all worked on tickets, and you had to buy tickets in X multiples, of course you'd end up with some left at the end which you couldn't return.
Did not feel like Christmas at all, just a cold fairground.
Santa, you had to book a time slot for, we queued and it took about 40 mins to get in. They had 3 Santa's running with elves which helped move the queue along. When you finally walked in it was very good inside, well decorated, felt just like a film set. But you had 3-5 mins max and given a little gift and hurried out. Not something we are repeating this year.