Vintage Omega 1012 restoration help

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Hello everyone.
This is my first post.I own an old Omega watch and would like to find out as much about it as I can so I can get it fixed,it has much sentimental value.
It ran slow when I had it and then I put it in my desk drawer.20 years later..
It needs new parts and a service/rebuild.It also needs new links about 20mm worth ,I though they were beads of rice but the links are flat and also the back edge has a deep chamfer to stop the strap pinching your hairs,which is nice.
Can anyone give me a recommended place in the UK to have them fixed at a reasonable cost,and also what the strap is and where to source links?