Solution to 1A has been deliberately left unsolved and is to be answered only by a non-regular/novice commenter, with proper annotation. Those who have answered earlier in the week, please give others a chance.
Open for anyone to solve, if not solved by 1 PM.
ACROSS
1 Storing cotton in the bar basement (6) P?I?T? (Addendum - PLINTH {P{LINT}H} - See comments)
4 Right in the contre of good French resort (8) BRIGHTON {B{RIGHT}ON} CONTRE appears to be a typo for CENTRE
9 Minion heading west with almighty friend (6) LAPDOG {GOD}{PAL}<=
10 Manage to include everyone - one is the Goddess of music (8) CALLIOPE {C{ALL}{1}OPE}
13 Set aside some money, including private banks (6) REPEAL {RE{Pr...tE}AL}
15 None can go faster than this brand of men's swimwear and escape (5,2,5) SPEED OF LIGHT {SPEEDO}{FLIGHT}
18 Play the host, party, and the hours carry on (2,3,7) DO THE HONOURS {DO}{THE}{H{ON}OURS}
24 Jailhouse for fliers (8) CANARIES [DD] ( Correction - {CAN}{ARIES} - See comments)
26 Chat counter (8) CONVERSE [DD]
27 Severe problems - indicates extreme life-threatening condition (6) SEPSIS {Se...rE}{Pr...mS}{In...eS}
DOWN
1 European film on a professional writer (8) POLEMIST {POLE}{MIST}
2 Self introduction of Bill, the conman (8) IMPOSTER {I'M}{POSTER}
3 Also, change route and go to bed - difficult to believe? (3,4,2,2,4) TOO GOOD TO BE TRUE {TOO}{ROUTE+GO+TO+BED}*
8 Enlightened action, nothing to provoke (6) NEEDLE EnLightENED*
20 You'll find it in wood lining, perhaps (6) LIGNIN*
23 Income's sufficient for feeding people here (4) MESS [T]
Reference List
Bar = PH, Good in French = BON, Party = DO, Good = G, Toilet = LOO, English = E

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