Will the Iphone 16 Pro still be sold in-store after the Iphone 17 is released in the UK?

No one here can say for sure, especially since as of this writing, there is no such thing as an iPhone 17. No such thing has been announced.

That said, if Apple follows their historical trend, the previous year's 'pro' versions are discontinued when a new one is introduced. 3rd party authorized retailers may continue to sell existing stock, but Apple Stores stop selling it immediately.

Probably no, as every year, it repeats, ex: iPhone B lineup comes out, Apple only now sells iPhone A (normal version) and iPhone A Plus. So I’m expecting it to be offsale in real apple stores and the apple.com after the iPhone 17 lineup comes out, but the ones on the Apple Authorized Reseller Stores will still exist.

No one here would know that, as we are users like yourself and have no inside information of what Apple might or might not do.

You will have to wait until the new iPhone goes on sale.

Will the Iphone 16 Pro still be sold in-store after the Iphone 17 is released in the UK?

Apple decisions on any new product intros, and on a user-to-user site like this one, we have no way to know what Apple's plans might be.

As of this time, we have no idea about anything that you call an iPhone 17, since there has not has not been official notification from Apple about this.

Re: “ … No such thing has been announced … “

True statement!

Given the recent OS numbering scheme revamp, I just refer to them as ”iPhone next”