Top Notch stretched his winning run over fences to four with an emphatic success in the Betfred TV Scilly Isles Novices' Chase at Sandown.The six-year-old confirmed his place at the Cheltenham Festival, where his options include the JLT Novices' Chase, with a polished performance.Amore Alato and Baron Alco made the running but the other three members of the field were never far away in what was a tight Grade One.Top Notch (11-4) jumped the obstacles with proficiency and Nicky Henderson's charge sealed victory with a fine leap at the final fence.Galloping resolutely up the hill, he scored by five lengths from Baron Alco, with Le Prezien another length and a quarter away third.Clan Des Obeaux, the 13-8 favourite, was most disappointing.