A builder gave me a price of £35 per hour to do some work on my house. I agreed verbally, nothing in writing from the builder. The builder started the work and brought along his labourer. When the work was finished he sent me his invoice which had an extra £1900 added to it for his labourer. I am disputing this with the builder as having to pay his labourer was never mentioned when he quoted me for the work or at any time whilst the work was being done. I’ve paid the builder his money but refuse to pay for his labourer. He’s now threatening me with court action. Should I have to pay??