Hi Cayetana,I would second Chester (Iain). My family are from St Helens not too far away from Crawshawbooth.If you get to Chester it has an amazing wall surrounding the city and some of the oldest buildings in Britain that are still in use.One of the oldest buildings is now a takeaway (burger king or something like that) however you can freely enter (and not purchase) and then go down into the basement and explore.When you get to Chester make sure that you go to the main tourist information office and register for the free guided walking tour. IT IS A MUST DO!It takes a couple of hours but well worth it for you will see incredible things mixed up with the every day modern city. Make sure you put your "Welsh" out of the city gates at night as it is still the law.Also for me the East coast was a highlight from York across to Whitby. As an Australian of a UK family Whitby was the port for Captain Cook, Viking raiders and Bram Stokers Dracula!Have a great visit to Britain.