need to get the non immigrant b visa as i will be working in Thailand any info will be of great help do not want to be travelling back to uk to get this if at all possible

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If you're in Thailand, you will need to travel outside to get it, usually people opt to visit the consulate in Vientiane, Laos. there are guidelines along with a form to use available on the Royal Thai Consulate's website. Here is the one for Laos;

http://vientiane.thaiembassy.org/vientiane/en/consular/consular_check/

Wil you be working for a Thai company?

You will need to get paperwork from the company in order to apply for a non-B visa. But the requirements depends graetly on where you will apply, in Asia or Europe or another Western country.

will be working offshore in thailand company etc is all registered here have there letter of invite company affidavit and foreign buisness licence

and a letter to the thai embassy is there anything else i would require???

I had to get a Non-B Visa last year, whilst still being on Thai soil. I was advised that I had to go to Singapore, by the company, to apply for my visa and that I would only get a 3 month Non-B visa.

The company gave me a lot of paperwork, there were things like the company tax details, company registration in Thailand so on and so on. They also gave me a contract, which I had signed, along with the letter of the job offer.

Got to Singapore and went to the Consulate, handed all my docs in with the correct fee and photos etc. Got a receipt and told to come back the next afternoon. Here is the Thai consulate in Singapore. I think you can also do it in Laos, but the company I was working for had had people turned away from there.

will be working offshore in thailand company etc is all registered here have there letter of invite company affidavit and foreign buisness licence

and a letter to the thai embassy is there anything else i would require???

Here is the current list of requirements for a Non Immigrant Category 'B' Visa - best you will do in SE Asia is 90 day single entry if you don't have a WP, but the application is under process:

http://www.mfa.go.th/main/en/services/123/15388-Non-Immigrant-Visa-%22B%22-(for-Business-and.html

I find that the Thai consulate in Hull has clear information on its website:

2) Applicant taking up employment in Thailand with a company located in Thailand.
Evidence required:
a) Sponsor Letter from Thai company offering employment – a letter from an agent acting for
the employer is not acceptable.
b. Copy of registration documents from Thai company.
c) If applicant is to be employed as a teacher they must also provide a copy of their Teaching Qualifications and a valid UK Criminal Records Bureau (CRB) Check.
For more information please visit the relevant website:-
England & Wales: http://www.homeoffice.gov.uk/agencies-public-bodies/crb/
Scotland: http://www.disclosurescotland.co.uk/
Northern Ireland: http://www.dojni.gov.uk/accessni
Please note that only a single entry visa will be granted in these circumstances. Applicant
or employer will need to arrange Extension of Stay or Work Permit as appropriate.

Source: http://www.thaiconsul-uk.com/download.aspx?id=20130520183847

Give them a call to ask for any additional information you may need. You can get the visa by mail and the consulate has a reputation for fast service.