It seems that the fare basis is VSECAMPR.
[KVS Availability Tool 3.0.3/Platinum - WSpan: LON-STO/SK/VSECAMPR/31 GBP]
Code:
LONSTO-SK 5FEB08 *RULE DISPLAY* TARIFF 0021 RULE EMEA
* ADD APPLICABLE TAX * FED INSP FEES *
FARE BASIS GBP NUC PTC FT GI
VSECAMPR R 30.00 61.20 ADT EX EH
VSECAMPR/CH33 R 20.00 41.00 CNN EX EH
VSECAMPR/IN90 R 3.00 6.12 INF EX EH
VSECAMPR/IN33 R 20.00 41.00 INS EX EH
VSECAMPR/CH33 R 20.00 41.00 UNN EX EH
BOOKING CODES V
FIRST TRAVEL -24JAN08 LAST TRAVEL -31MAY08
LAST TICKETING - 6FEB08
SEASONS - NO RESTRICTION
PENALTIES - CANCEL-NON REF BEFORE/AFTER DEPART
CHANGE-NO CHANGE TO RES
FOR ALL CONDITIONS SEE TEXT RULE
DAY/TIME - NO RESTRICTION
ADV RES/TKT - TKTG WITHIN 24 HOURS
AFTER RESERVATIONS RESERVATIONS 2 DAYS
BEFORE DEPART STANDBYS NOT PERMITTED
ALL SEGMENTS MUST BE CONFIRMED
RES/TKT ISSUE REQ SAME TIME
FURTHER RESTR APPLY SEE TEXT RULE
MIN STAY - NO RESTRICTION
MAX STAY - NO RESTRICTION
BLACKOUTS - NO RESTRICTION
SURCHARGES - SEE TEXT RULE
STOPOVERS - NOT PERMITTED
TRANSFERS - NO RESTRICTION
FLT APPLIC - ANY SK FLIGHT SK OP CXR WF
ANY FLIGHT SK OP CXR BU ANY FLIGHT SK
OP CXR KF ANY FLIGHT
CHILD DISC - CNN 2-15 YRS 33 PCT ACCOMPANIED
1ST INF UNDER 2 YRS 90 PCT NO SEAT
INS UNDER 2 YRS 33 PCT WITH SEAT
UNN 5-15 YRS 33 PCT UNACCOMPANIED
OTHER DISC - NONE
COMBINABLTY - SEE TEXT RULE
ELIGIBILITY - NO RESTRICTION
ACCOM PSGR - NO RESTRICTION
TVL RESTR - OUTBOUND MUST BEGIN ON/BEFORE 31MAY 08
SALES RESTR - TKT ON/BEFORE 06FEB08
NEGOTIATED - NO RESTRICTION
TKT ENDORSE - ORIGINAL TKT - RESTRICTIONS APPLY
ORIGINAL TKT - PER FARE COMPONENT
MUST APPEAR IN ENDORSEMENT BOX
APPLICATION - SEE TEXT RULE
MPM - EH 1039 VIA EASTERN HEMISPHERE
INDUSTRY FARE TYPE - XAN - APEX NONREFUNDABLE
ROUTING 496 FROM-TO LON-STO*