Hi Ghost,
Everyone you speak to and every message you read is likely to tell you to use a solicitor before you do anything in the property market. This isn't bad advice, and is vital in the resale market and with many smaller developers. If you have no language skills or no knowledge of the legal system it is very important you have someone checking to see if there are charges on the land, all licenses in place, help with connecting utilities and often just as a point of contact representing you in Spain. The Spanish would never use (or very rarely) a solicitor as a lot of the work is very easy to do or unnecessary. Also many solicitors actually do nothing at all and allow the notaries secretary to do literally everything - they just turn up, pretend to be interested and hand in their invoice on the completion statement.
With Polaris World, they have bi-lingual staff and an open if occassionally slow and frustrating legal department BUT in my opinion (please dont sue me!) it is not necessary to use a solicitor with a PW property. If you have an issue wiuth them in the future, you may wish to get one but I cant think of a circumstance that it would be necessary.
Good luck and dont worry, you have saved yourself some money!