I don't have any advice to offer with regards to the business itself. But with regards to your website, it's worth registering your own domain like
www.greenbeltgardens.co.uk. Looks far more professional and it will be helpful for Search engine optimisation (making your site appear higher in the search engine listings). Once you have a domain registered, you should also be able to create an email address using that domain like 'something@greenbeltgardens.co.uk'. Again, it just looks a lot more professional than a hotmail address.
This isn't something essential, but something worth considering if you have the time to sort it out.
Also, you should know that your website is entirely designed using javascript. This isn't ideal as it means that if anyone has it disabled (people using incredibly old web browsers for example) then your website is totally inaccessible. It will most likely violate web accessibility laws also.
Again, you might not consider this a problem right away as you're only operating a small business, but something worth considering for the future.