My kitchen sink plug whole stinks, is this a proper under sink setup?

[Jdh410]

Evening. I’ll start by being honest, I’ve no idea with plumbing, I’ll understand basic concepts but...
The house I’ve bought has a kitchen with the below photo of underside of the sink. In a morning or at occasions where it’s been left for a while when water (or whatever really) is drained off, the drain produces a horrid smell. But I’ve no idea if this is a basic kitchen sink set up, I don’t really have the option with going round to a friends place to compare with COVID going on.

The lack of U bend makes me thing that’s what causes the smell, but like I said I’ve no clue. The drainage pipe simply goes to the outside brick wall and into a drain.
Would it be a case of simply getting a U bend and some flexor piping? Any help or just pure banter is welcome. I have used drain cleaner btw

 

[moonlight]

Ikea rubbish, bottle traps not good for sinks and the flexi waste drops below the outlet. Needs sorting out.

 

[Ben-gee]

I would take that out and start again.

A new strainer waste, a standard p-trap and then rigid solvent weld pipework will solve all your (sink related) problems.

 

[rpm]

The bottle trap has been fitted instead of an U-bend (often seen), must agree with moonlights comments above though. The back board will need to be cut away or removed to find the end of the flexi. The bottom of the bottle trap looks like it unscrews so should be able to remove it and clean it out as a start point for now.