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Hello

If Sheffield is the only target then Sheffield needs to form part of the keywords strategy. Local SEO works in the same way as national SEO strategies except on a more targeted approach. They will still want to appear in organic SERPs when people type things like Hair Salons Sheffield etc. Local directory listings can also work well as sites like Yell.com rank well for targeted searches. Hope this brief response helps.

The disavow does take anything up to 8 weeks to go through and that's if it goes through at all. I have seen instances where it has been ignored and instances where it went through in just a couple of weeks. It all depends on what Google thinks of your site. Make sure any link building is legitimate and high quality as if you are still building poor links and disavowing then Google will not look kindly on your website.

LIke others have said. It can vary from site to site. I have seen examples where it has been the next day and others 2-3 weeks later. Google typically deep crawls a site a minimum of once a week but it does not guarantee that it will crawl all pages when it does so it may have been missed in the latest crawls. I have found also, sites with sound internal link structures get more pages crawled at a time. I guess the google crawler likes a easy read of a site.

regards

Dave

Personally if you are using a tool like Open Site Explorer and are already undertaking a link cleaning exercise. If you identify no follow links on spammy or dodgy sites then I would add to the disavow as you are doing this anyway.

I would rather clean all links as who know that Google will change next so I prefer to ensure everything is legitimate and as it should be even if our clients currently aren't being penalised.

I wouldn't go out of your way though to disavow these no follows if you are not cleaning your links anyway.