Hamilton’s first Ferrari win in Barcelona closed the gap to 41 points behind Mercedes’ championship leader Kimi Antonelli.
McIlroy slipped seven off the pace after being in contention at the turn.
Pollock played an influential role in Northampton reaching Saturday’s Gallagher Prem final against Exeter.
The tourists led by 445 at lunch on day four.
Four-year-old suffered a bad fall last year that still has Jim Crowley on the sidelines.