I have small issue, I have found some hand painted characters that I wish to rearrange, create an extra couple letters, by cutting bits off and pasting bits on making a logo for a range of clothing for a high street store. I can not find out who the author is and the image was found on pinterest. If I rearrange letters and create a vector is this cool?
Since you say 'high street', I assume you are in the UK?
Legally, you're probably fine...mainly due to the bizarre status of typeface design protection. I am not a lawyer, and protections do seem a bit better in the UK than the US, but there's likely no actual copyright infringement here:
After all, many typefaces are based off of existing signage and art.
Ethically, though, it's pretty lazy. If you like the style, why not adopt the style, but come up with your own lettering based off of it? Benefits are that it's then truly original.