There would be an increased stamp duty liability for most people for the purchaser if house and contents were sold for 382,000 rather than 381,000 as the sale would be above a new threshold for second time buyers or investors.
Unfortunately, in my experience this happens all too often. I have heard of numerous people who have paid e.g. 190,499 + 10,000 cash in the old days when this was the limit for FTB exemption from stamp duty. Various estate agents seem to use it to push up prices for their clients but I suppose as a facilitator for the process, they're only passing on the offer to the vendor rather than being directly part of tax evasion. It's up to the vendor to accept or reject the offer and up to them to deal with the tax implications on their side.