Hi guys thanks for advice. Just an update
I went in a shirt (not a Hawaiian one) with a plain black tie, black trousers and polished boots. Did a bit of research on company beforehand. Interview went well even tho I was nervous.
That was yesterday, today at 14:00hrs I get a phone call, I had impressed them greatly and was offered the job!
Cards in, van + fuel card + bonus scheme etc. I'm over the moon that I've landed a cards in job. The job seems easy enough its reactive maintenance electrician for a large outdoor advertising company (JCDecuax's only big competator) .
Thanks for the help and advice