Mk1 Golf cabriolet 1.8

Hi 
Currently looking for a 1.8 reconditioned engine for my mk1 golf cabriolet or anyone who can recommend a good service who will carry out this work on my current engine. Engine is beginning to give a slight knock so I'm beginning to think either head gasket or piston rings. Always knew when I bought the car it may need work but it's a project now so hoping anyone with more experience than me on here can point me in the right direction. Cheers G 

If it's a knock it's more likely to be worn big end bearings.
You might be looking at new main and big end bearings, rings probably worth doing but you won't know for sure until it is inspected. A straight forward rebuild might be £700, maybe more if you need a crank regrind and a head skim. Haven't seen many recon engines for sale. If you are handy with spanners and have a Haynes manual it's not a difficult job if you take time over it. A lot of folk are put off engine building but it can really only go together one way. Machining work will require a professional.
Where are you based?

Thank you 
I'd love to have a go myself but unfortunately with my line of work I can be extremely busy. I'm based in Stoke so I'm currently searching for reputable companies and have found some already. If the jobs are small I'll have a go but to refurbish an engine sounds very scary so we'll done you o. Your project it looks amazing on the threads.