The August 2031 index-linked gilt trades at an expensive valuation, RBC Capital Markets strategists say in a note. The index-linked gilt is set to be auctioned by the Debt Management Office at 0900 GMT and this is likely the bond's final tap, they say. The strategists have a 'sell' bias on the August 2031 index-linked gilt, which is due to fall below the five-year maturity segment in August. (miriam.mukuru@wsj.com)