I've just been looking around at jobs and came across this one for a vessel fabricator/welder, using TIG. I think the job is based in March, Cambridgeshire, for around 10 weeks with the possibility of an extension.
https://jobsearch.direct.gov.uk/GetJob.aspx?JobID=3818747
https://jobsearch.direct.gov.uk/GetJob.aspx?JobID=3818747