Non-gaming, fast and quiet pc

[Flimbyite]

Hi, I am thinking of building a new pc as my current one is now nearly 7 years old.
My pc has an I7 4470 (using its own graphics) with a samsung SSD and 16 GB RAM.
I don't bother with gaming but I use adobe products quite a lot such as indesign and illustrator.
I also like to do a bit of video editing.
I would like something that would be faster and as quiet as possible and be good at multitasking.
My budget is £800

Any suggestions on how you would specify a decent system would be appreciated

[wonderlust]

To be honest, I think you don't need to upgrade much.

Maybe a bigger SSD and/or more RAM?

[Flimbyite]

Apologies for not replying sooner.

No worries wonderlust thanks for your suggestion.

I will keep going with what I have for a while longer.