UK's Haleon set for worst day since debut after outlook cut, sales miss
** Haleon HLN.L shares tumble as much as 17% to 310.5p by 1051 GMT
** Stock set for worst day since 2022 listing, if losses hold
** HLN worst performer on European and British benchmark indices .STOXX, .FTSE
** Consumer health group cuts 2026 revenue growth forecast to ~2.5%, below analysts' expectation
** Q3 organic revenue misses estimates
** CEO warns staff of "difficult choices" ahead, according to memo seen by Reuters
** Top end of medium-term organic revenue growth target "looks like a stretch" - RBC Capital Markets
** Adds consumer health remains among least-favoured sectors following rival Reckitt's RKT.L results
** HLN down ~13% YTD
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