You good people are always very helpful. 
can you please recommend what I could do to fix this mess? 
 

it was covered up by skirting board

 

its a harmony timber frame construction 

if that helps 

 

The vapour barrier is missing in this part but its in the rest of the wall 

 

 

Edited May 21May 21 by Alwayslearning22

Edited May 21May 21 by Super_Paulie

36 minutes ago, Super_Paulie said:

Thanks for the reply
thats what I was thinking to use but I would like to prevent condensation hitting the wall plate and studs. Will this prevent that from happening? 
I can’t understand why someone would butcher the wall like this removing  vcl and insulation etc 

 

Any other ideas on how to fix this? Don’t want to make things worse 

Just fill it full of foam, cut it back, skirting board back on. That's what I'd be doing.

2 hours ago, Super_Paulie said:

Just fill it full of foam, cut it back, skirting board back on. That's what I'd be doing.

The sane mind would do that but. I’m an ocd maniac who worries about the trapped moisture in the sole plate I also have a very damp slab that’s taking ages to dry out.

Thanks for the reply