Seal gap between tap wall plate and wall

[keyzjh]

Hello, I have a garden tap fitted with a wallplate that is connected to the kitchen on the inside wall.
Currently having a kitchen re-done, and this copper pipe has been pushed out slightly, leaving a gap between plate and wall.
The brick wall is rendered.

This is the wallplate+tube: https://www.toolstation.com/made4trade-wallplate-tube/p10508

I tried tightening the screwn but it doesn't move, presumably because the copper pipe on the inside will need to be shortened.
I want to avoid shortening the pipe as the plastering work is already done.

How do I seal this gap to avoid water ingress?
Silicone sealant? Masonry filler?

 

[blup]

Unscrew the fixings and tap the plug back in, re tighten.

 

[foxhole]

Bit of silicon though the hole should have been drilled with a slight incline to avoid any rain ingress.
If it’s loose pop a washer behind each screw to pack it.