What type of multiple-entry business visa should I apply for as a British businessman frequenting Thailand?

looking at the Thai Embassy site in London, there is a 1 year or 3 year multiple entry visa for business people, however when i click on the link in the faq on their page it just takes me to a page of numerous different visas, could you advise which Visa I should be looking at please, below is from their site

2. As a British businessman, I need to travel a lot. I have to go to Thailand very frequently on business. Is there any facility for frequent business travellers like me?

You can apply for a 1-year or 3-year multiple-entry business visa which would allow you to travel to Thailand as frequently as you want while the visa remains valid, and you would be permitted to stay for a period of not exceeding 90 days on each visit.

You can find more information on the basic requirements for visa application at www.consular.go.th. To ensure that your application will be conveniently processed kindly check with the Royal Thai Embassy at www.thaiembassy.org/london.