Here's my mod order.
_001_ Morrowind.esm
_002_ Tribunal.esm
_003_ Bloodmoon.esm
_004_ Morrowind Patch v1.6.4.esm
_005_ Better Heads.esm
_006_ Texture Fix 1.8.esm
_007_ Better Heads Tribunal addon.esm
_008_ Better Heads Bloodmoon addon.esm
_009_ Bloodmoon Landscape Overhaul 1.0.esm
_010_ MW_Children_1_0.esm
_011_ EmmasTelMora1_0.esm
_012_ EmmasDagonFel.esm
_013_ AreaEffectArrows.esp
_014_ AtmosphericSoundEffects-3.0.esp
_015_ AtmosphericSoundEffects-3.0-Tribunal.esp
_016_ Hold it - replacer.esp
_017_ LGNPC_NoLore_v0_83.esp
_018_ Lgnpc_SN.esp
_019_ Siege at Firemoth.esp
_020_ BetterBooks_AlchFormfix.esp
_021_ P.R.E. v4.0.esp
_022_ Better Bodies.esp
_023_ The Imperial Legion Badge.esp
_024_ Better Clothes_v1.1.esp
_025_ Syc_HerbalismforPurists (Pearl Bug Edit).esp
_026_ Syc_HerbalismforPurists_BM.esp
_027_ Syc_HerbalismforPurists_TB.esp
_028_ Pursuit Enhanced.esp
_029_ Less_Generic_Bloodmoon.esp
_030_ DM_DB Armor Replacer-ExpDDBA.esp
_031_ LGNPC_GnaarMok_v1_10.esp
_032_ LGNPC_AldVelothi_v1_20.esp
_033_ LGNPC_MaarGan_v1_20.esp
_034_ frostmoth_repaired_v0_31.esp
_035_ LGNPC_HlaOad_v1_32.esp
_036_ LGNPC_Aldruhn_v1_20.esp
_037_ LGNPC_Aldruhn_v1_20_suppl.esp
_038_ LGNPC_Pelagiad_v1_22.esp
_039_ LGNPC_TelMora_v1_20.esp
_040_ LGNPC_Khuul_v2_10.esp
_041_ LGNPC_VivecFQ_v2_10.esp
_042_ LGNPC_TelUvirith_v1_20.esp
_043_ LGNPC_SecretMasters_v1_30.esp
_044_ LGNPC_IndarysManor_v1_51.esp
_045_ LGNPC_VivecRedoran_v1_50.esp
_046_ Less_Generic_Nerevarine.esp
_047_ New Argonian Bodies - Mature.esp
_048_ New Khajiit Bodies - Mature.esp
_049_ Starfires NPC Additions ver-1.11.esp
_050_ Less_Generic_Tribunal.esp
_051_ almalexia armor.esp
_052_ Clean Chargen_Revamped_v2_3.esp
_053_ Keyring.esp
_054_ EmmasKhuul.esp
_055_ WA_Signy_Signposts(!).ESP
_056_ MDP Compilation.ESP
_057_ LGNPC_PaxRedoran_v1_20.esp
_058_ LGNPC_SoulSicknessPatch_v1_00.esp
_059_ Hold it - SF npc addon.esp
_060_ Hold it - COM addon.ESP
The mod order is from mlox and according to mlox it is fully optimised.
I'm hoping someone recognises the problem as a known issue with one of the above, or at least can tell me where I might look to solve the problem so as to avoid playing the brute force search remove-one-mod-at-a-time game.
Thanks in advance.