It's not cost-cutting. It's a way to encourage people to buy the more expensive versions and consequently I expect they don't plan on selling many Explores. A customer will look at the adverts and see "from £14,995" and think "that's cheap, I'll take a look at them". When they take a look they will find that the £14,995 one lacks key features (like remote control locking) and is available in a far narrower range of colours (the Explore comes in just two colours black or white) and just buy the £17,495 or £19,495 ones.
They will have Explores available (though maybe only to order as another disincentive to buying one?) if people really want one because to not have them would be against advertising laws.