as others have posted a multi entry non immigrant 'wife' visa would give you a 90day permission to stay stamp on each arrive during the validity of the visa
every entry into Thailand ( tourist visa, visa exempt, or a non immigrant visa) other than a re-entry permit entry allows you to obtain a 60 day visit Thai wife extension at local immigration office 1,900thb wife has to be with you.
once in Thailand on a non immigrant visa you can obtain a 1 year visit Thai wife extension again 1,900thb, but as you married outside Thailand you will need to jump through lots of hoops to have your marriage accepted and registered in Thailand, these hoops need to be done in The UK ie translated, legalized with apostille' stamp. sent to Thai embassy etc.