You need to reduce the physical file size of the dog photo, at over 700kb it will be slow to load.
Having the Weebly advert for free websites doesn't resent a very professional feel to me.
You're using a btinternet email address, which again doesn't feel very professional. It should be an @supremecleansheffield.co.uk address.
Some of the code isn't great, but I suspect that is a result of using a WYSIWYG styl editor (Weebly).
Having said all that, the general feel of the site is clean and to the point. Though I'm not keen on the black border at the top of the page.