Does anyone know if it is possible to get a non-imm B , multi-entry visa, from Hull, which is valid for 1 year, and therefore allows you to stay in the country for 1 year?

I would have documents to show that a company in Thailand is offering me employment

Thanks,

Only an extension of stay from Immigration inside Thailand would allow a one year stay without leaving.

A multi entry non immigrant B visa allowing unlimited travel and stays of up to 90 days each for a one year period would be what you obtain from a Consulate. You would need to check with that Consulate on exactly what documents they require to issue such a visa.

Typically if coming for work which be on an extension of stay you are normally only given a single entry