I was told years ago,it was a waste of time putting loads of terms and conditions on the back of invoices and quotations, as if unreasonable would be no good in a court of law and could be deprimental,so leave blank and normal contract law applies
But maybe something like below my help
If I do a bit,you pay a bit,If I do some more,you pay some more
My prices ar'nt cheap,but they are said to be fair
And I wipe my feet when I walk through the door
I respect my surroundings and damage no wear
I sheet the work area and dress in correct safety gear
I will use quality materials,that will last you a good while
Cutting no corners,carrying off projects in style
I will respect your property as if it was my own
If you have any after sales quaries,you just have to pick up the phone
We have no contract and works carried out on trust
I will carry out my part but prompt payments are a must
I gave you my estimate,you found fairer than most
Do'nt try to play me with lost cheque books or payments in the post
Cash flow is important and you know the final outstanding ammount
Works were finished on time and now its time to pay your account
I take cash,cheque,bank transfer or card,so stick to what was said
Be honourable,pay up now or wake up next to a horses head
Boom!Boom!
😀😀