Good luck.
My Uncle Harold recently bought a new three bedroomed estate house in Tunbridge Wells. He then went to the sales office at the edge of the site, dressed in a suit, put on his best accent and armed with a sob story, asked for a free upgrade to a five bedroom house with a view over the Weald. He had been a builder in Lanarkshire and his wife worked as a secretary to the company that supplied the windows to the developer.
He learnt a few new words that afternoon and still lives in a three bedroom terrace house.
My other Uncle had ordered and paid for fish and chips and then asked for ......... you can guess the rest.
Good luck.