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European BA destinations without lounge access.
As investigated by FlyerTalk's very own c-w-s. (See post.)

No lounge, and no other lounge in airport: Typically these airports also have very limited facilities airside
BGO, BIA, BIQ, CFU, CHQ, CMF, EFL, EGC, FDH, FSC, FUE, GNB, GRX, JSI, JTR, KGS, KLX, LEI, LIG, MAH, MJV, NTE, OVD, PUY (their VIP lounge isn't available to passengers), PVK, UIP, ZTH (LCY has an external lounge in a separate building, so in the CIP category).

No lounge, but vouchers provided
LPA perhaps temporarily as of 1 May 2019

No lounge for BA, but there is for other airlines / Priority Pass
ACE, CAG (see this post), CGN (route suspended), FNC, HER (lounge opening times restricted), HUY (route suspended), KRK, OLB (BA charter CE can use lounge however), OPO, NUE (lounge is airside but register landside) Lounge at NUE now available to BA PAX (see this post), PMO (lounge closed until end of 2022), SKG , SPU, STR, SVQ. For RHO (see this post), TLL (route suspended).

No lounge for BA, but airport CIP lounge available
BDS (but very limited in scope, €25 online), BJV (€25 walk up fee), JMK (also PP), LCY (separate building), MPL (€18),

New routes with lounge
AAL, BIO, FLR, INV, KRK, VLC.