I would advise against trying to scrape the search results page. It seems to always return a constant number of results and it will be hard to ensure you cover all of the UK (by entering different addresses)
Instead, all of the shops have their own page, with address and details.
You will notice that the end is a simple numerical ID.
just itterate through the Ids by incrementing by 1, and collect information for all the stores!
Also, I do know this is a scraperwiki forum, but for somebody just starting, I found using google sheets and IMPORTHTML() and IMPORTXML() functions a LOT simpler than writing a full scraper from scratch. Especially with simple, nicely formatted websites like this. You could probably have the whole dataset ready in under an hour, including cleanup / formatting.
Jo