Hi, I have lost 1 key of Skoda karoq. It is a kessy key. The showroom is Charing £400/- for a new one. Is their any cheaper option?

The cheapest solution would be to find the key, but that's not going to happen.
You can try to see if some nice soul has bothered to actually hand the key into a Police Station, but with so many in London,  the odds are you won't locate it.

 

Not sure if your car insurance will cover you for lost keys, or your home insurance... worth a check.

 

You might be able to get a key from an independant garage (non dealer) for a little less, but not much I would say.

Thanks! Will try finding one.