63. Gilt issues are nowadays issued by price auction. Bidders receive Gilts at the price they bid and the success of a conventional auction is measured by the "Tail" - the range of prices from the average to the lowest price. Eurobonds, sold at a spread to Gilts ("spread product"), are never sold in the UK by auction but are nowadays distributed by underwritten placing or a non-underwritten placing via a book building process. There are other methods of sale but a placing to professional investors allows bonds to be listed on the London Stock Exchange on a concessionary basis with the necessity to publish very limited listing particulars. Both these methods of placing should ensure full placement of bonds.