The domain name (and possibly the website) are company assets that can sold but, so far as I am aware, there is no other way you can acquire them.
Be aware that liquidators are legally obliged to get fair prices this often means goods are auctioned. Also, new companies often reappear with the same management and a slightly different name. In this case, whether legal or not, desirable assets usually find their way to the new company - that's just a fact of life with small businesses in the UK.
Kaled.