Visas and Immigration (Georgetown)

Hi everyone. My wife and i are from England but we have spent the last 6 months in North Brazil. We are considering going to Georgetown in December and want to explore the possibility of staying long term. We know that we can be here for 3 months on our UK passport and we could leave and re enter to get more time. However, does anyone know if there is a way of obtaining long term visas? I had a business in UK as a consultant and would consider starting a small business in Guyana but am struggling to find information about the legalities and if a foreigner is allowed to do this.
If anyone in the community has any experience with immigration or knows of any lawyers or other professionals that may be able to answer these questions, i would really appreciate it.
Thank you.