11 On the West Ruislip refurbishment, Metronet carried out detailed design work prior to the completion of its survey work. This led to a number of problems. Metronet installed rubber flooring in the ticket hall that later had to be replaced. There was also disagreement over the extent to which station assets had to be compliant with the standards. Metronet planned to comply with standards for all new lighting installed. London Underground, however, required Metronet to make compliant all of the stations lighting, even elements which Metronet considered fit for purpose and had not planned to work on. London Underground requested this even though West Ruislip was a refurbishment and not a full station modernisation.