There are just so may things that could go wrong and would need checking, you could end up taking a property with all kinds of legal problems. Please please see a lawyer and get it done properly. Make sure they do commercial property work as well, i would warn against temptation to get a cheaper deal with a lawyer who does residential property as commercial property is it's own specialism esp if a sale of a business as well.
Try
http://www.lawsociety.org.uk/choosingandusing/ findasolicitor.law to find someone.
Some places have free legal surgeries and free initial interviews and there are rules in place for firms and the cost infirmation they have to provide in an initial letter (called a client care/Rule 15 letter) and throughout the transaction.
You could ask for a quote but make sure it includes fees AND what we call disbursements (charges for things like copies of the title registers, searches etc...) and lets you know what VAT is charged on so you get a realistic picture of the costs involved.
I don't want to sound like I'm lecturing you and don't want to scare you but just wanted to let you know what you could be letting yourself in for.
Hope it all goes OK for you :)