We shopped around and finally settled on a quote from a local company to supply and fit worktops for our new kitchen. The company reviews well. They've now asked for 50% of the final cost ahead of the template being drawn up. I baulked at paying so much before they've even stepped inside our home, so they then said it was fine to pay a nominal template fee, but they would still need 50% before going into production to produce the finished top. Is that normal?