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Aha - thank you so much.  I thought I had already checked my internal links but double-checked again after your response and you were completely correct.  There was a horrendous error with our code that led an example link being added to every page rather than the correct one.  Thank you helping me look in the right direction to find the solution!

We have an e-commerce site that has about 50k pageviews of our main shop page every week.  However in our Google sitelinks we have one for 'Shop'. However, for the Shop sitelink Google is linking to a random URL that we have never & would never use as a URL and not to our Shop page.  I can't work out why Google would pick up this random url as we have so many links etc to the main shop page.  Why are they not linking to the right page?

I have blocked that url in webmaster tools and done a redirect but I want to understand why it happened in the first place. It included 'swedish+fish' so it seems weirdly spammy?!

Any thoughts would be really helpful (and I am only mildly techy).

Many thanks