What Car's 'target price' function suggests the following.
140 sportback S-line £21108.00
170 sportback S-line £21902.00
If you're not familiar with their 'target price' thing, it's for a UK car at a UK dealer.
In other words, a UK dealer has agreed that they will sell you that car, for that price.
If your own dealer won't match it, What Car will put you in touch with the dealer they used.
I've no idea how the above prices compare with the list price.