With VAT currently being 20% it is nice and easy to do it in your head, move the decimal point one place then multiply by 2. Your example of £144 would be £14.40 x 2 = £28.80
Please see my workshop now ready for the next project.
......... I see what you mean about tidyness in your workshop.
Kind regards, Colin.
And I will have you know, that is the tidy part of my workshop as @Tangledfeet will attest as he has seen the rest of it
I am a naturally untidy person and work better in such a place. If working in someone else's workshop I will however tidy up after myself as I respect the differences in the way people are and how they prefer to work.