Up-Sell Check Out Issue

Hi All,

So the situation is I have successfully added an up-sell product to my checkout process.

The issue I am having: There is nothing to stop users then removing the initial product from there bag and just purchasing the up-sell.

I am looking for a solution that doesn’t allow the up-sell product to be purchased by itself.

Have I made an obvious mistake or is this going to take some fixing?

Thanks,
V