I first bought from them over 7 years ago. As for price, maybe some mistake, get it before they disappear. You can order it wait and can only be sure you got it or they send email to you about the dispatch. Most web companies has some small print about this sort thing when they send you the confirmation of the order, i.e. the order confirmation is not a order.
Order it and they can only charge you what agreed. They may send you at £210 or reject your order. They cannot charge you more.
Print out the price page in case.