The product was promoted by Vauxhall (Robins & Day) but the information they provided was only the tip of the iceberg as far as cost was concerned. It gradually became apparent that there were a lot of additional costs for groundworks (exorbitant) and extra cable and the simple expedient of installing a locking mechanism (which was only mentioned by the fitter as the installation was nearly complete). Generally, communication on the phone was patchy. A survey on the ground was essential as the questionnaire process was not really workable in our case, but this was not offered and I had to suggest it.