You don't need a solicitor for this - there is nothing contentious or complicated.
Telephone your local Land Registry and ask them to send the relevant form and notice of the fee.
Click the 'contact us' button here
http://www.landregistry.gov.uk/
You may be able to do it online or at least download the form, but the Land Registry will ensure you use the correct form.
They really are very helpful.
This is assuming the land is registered. If it isn't, the Land Registry will tell you how to do that, too.