For reference, fare rules of a Business Saver ticket over the Christmas season for NCL-BNE for a 1-month say, this section should be roughly equivalent for all tickets on this route, all a bit of a mess to understand but basically repricing to one-way, YQ which is carrier-imposed surcharge, i.e. a random fee EK makes up to achieve dynamic pricing is not refunded, taxes are, that is probably what you received, with more thought and attention from someone higher up perhaps they might've refunded more, it's hard to say:

CANCELLATIONS

BEFORE DEPARTURE
CHARGE GBP 500.00 FOR CANCEL/REFUND.
WAIVED FOR DEATH OF PASSENGER OR FAMILY MEMBER.

BEFORE DEPARTURE
CHARGE GBP 1000.00 FOR NO-SHOW.

AFTER DEPARTURE
TICKET IS NON-REFUNDABLE IN CASE OF CANCEL/REFUND.

AFTER DEPARTURE
TICKET IS NON-REFUNDABLE IN CASE OF NO-SHOW.
NOTE - TEXT BELOW NOT VALIDATED FOR AUTOPRICING.
NO-SHOW -IF THE BOOKING IS NOT CANCELLED AT LEAST
2 HOURS BEFORE DEPARTURE
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CANCELLATION / REFUNDS
... CANCELLATION / REFUND FEES ARE NOT
COMMISSIONABLE.
... CANCELLATION FEE DOES NOT APPLY TO INFANT NOT
OCCUPYING A SEAT.
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WAIVERS
1.WAIVED FOR DEATH OF PASSENGER OR FAMILY MEMBER.
A COPY OF VALID DEATH CERTIFICATE ISSUED BY A
COMPETENT MEDICAL AUTHORITY IS REQUIRED.
FAMILY MEMBERS AS DEFINED IN EK CONDITIONS OF
CARRIAGE OR PASSENGER AIRLINE TARIFF RULE
BOOK.
2.NO WAIVER APPLICABLE FOR ILLNESS OF PASSENGER
OR FAMILY MEMBER.
3.CONTACT EK LOCAL OFFICE FOR WAIVERS DEFINED
ABOVE.
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CANCELLATION / REFUNDS AGAINST NO SHOW.
... A NO-SHOW FOR A FLIGHT IS CONSIDERED WHEN A
PASSENGER FAILS TO USE THE RESERVATION ONE
HOUR BEFORE DEPARTURE OF THE SCHEDULED
FLIGHT.
... FAILURE TO OCCUPY A RESERVED SEAT ON ANY
SEGMENT OF THE ITINERARY WILL RESULT IN ALL
SUBSEQUENT SEGMENTS OF THE ITINERARY BEING
CANCELLED. IN SUCH CASES ONLY NO-SHOW FEE
WILL APPLY AND NOT BOTH.
... NO SHOW FEE IS NON COMMISSIONABLE.
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CANCELLATION / REFUNDS AGAINST UPGRADES -
IF THE UPGRADED TICKET IS SUBSEQUENTLY CANCELLED
THE ORIGINAL CHARGE WILL APPLY.
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OUT OF SEQUENCE TICKETS -
ANYTIME TICKETS IS UTILIZED OUT OF SEQUENCE NO
REFUND OF FARE AND THE CARRIER IMPOSED SURCHARGE -
YQ.
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A.WHEN OUTBOUND AND INBOUND FARES ARE REFUNDABLE.
WHEN COMBINING FARES THAT HAVE CANCELLATION
FEES THE HIGHEST CANCELLATION FEE OF EACH
CANCELLED PRICING UNIT APPLIES.
A1.BEFORE DEPARTURE / FULLY UNUTILISED TICKETS
... DEDUCT THE APPLICABLE HIGHEST CANCELLATION
FEE FROM THE TOTAL OF THE BASE FARE AND
CARRIER IMPOSED SURCHARGE - YQ.
... REFUND THE RESIDUAL AMOUNT ALONG WITH THE
REFUNDABLE GOVERNMENT TAXES.
... CARRIER IMPOSED SERVICE CHARGE - YR IS NOT
REFUNDABLE.
A2.AFTER DEPARTURE / PARTIALLY UTILISED TICKETS -
AFTER COMMENCEMENT OF THE FIRST SECTOR OF THE
JOURNEY.
... DEDUCT THE OW FARE OF EQUAL OR HIGHER
AMOUNT THAN THE FARE PAID FOR THE PORTION OF
THE JOURNEY PERFORMED IN THE SAME OR NEXT
HIGHER RBD.
... COLLECT APPLICABLE CANCELLATION FEE AND
THE CARRIER IMPOSED SURCHARGE - YQ FOR THE
JOURNEY PERFORMED. DEDUCT NON-REFUNDABLE
TAXES.
... REFUND THE CARRIER IMPOSED SURCHARGE - YQ AND
UNUTILISED GOVERNMENT TAXES FOR THE PORTION
OF THE JOURNEY NOT PERFORMED.
... NO REFUND OF FARE AND CARRIER IMPOSED FEES -
YQ IF THE UTILISED OW FARE IS GREATER THAN
THE TICKETED FARE.
... NO REFUND OF FARE AND CARRIER IMPOSED
SURCHARGE - YQ IF JOURNEY PERFORMED BEYOND
THE TURNAROUND/FARE BREAK POINT.
... CARRIER IMPOSED SERVICE CHARGE - YR IS NOT
REFUNDABLE.
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B.WHEN OUTBOUND AND INBOUND FARES ARE NON -
REFUNDABLE.
... NO REFUND OF THE FARE AND CARRIER IMPOSED
FEES - YQ AND YR.
... DEDUCT NON-REFUNDABLE TAXES.
... IF NON- REFUNDABLE FARES REISSUED TO A
REFUNDABLE FARE THE ORIGINAL PAID FARE AND
CARRIER IMPOSED FEES - YQ AND YR WILL BE NON-
REFUNDABLE.
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C.COMBINATION OF REFUNDABLE AND NON-REFUNDABLE
FARES.
1.BEFORE DEPARTURE/FULLY UNUTILISED TICKETS.
... DEDUCT THE NON-REFUNDABLE FARE PAID AND THE
CANCELLATION FEE OF THE REFUNDABLE FARE.
... DEDUCT NON-REFUNDABLE TAXES.
... CARRIER IMPOSED FEES - YQ AND YR ARE NOT
REFUNDABLE.
2.AFTER DEPARTURE / PARTIALLY UTILISED TICKETS -
AFTER COMMENCEMENT OF THE FIRST SECTOR OF THE
JOURNEY.
2.1 IF OUTBOUND FARE COMPONENT IS NON-
REFUNDABLE.
..... DEDUCT THE OW FARE OF EQUAL OR HIGHER
AMOUNT THAN THE FARE PAID FOR THE PORTION
OF THE JOURNEY PERFORMED IN THE SAME OR
NEXT HIGHER RBD.
..... COLLECT THE CANCELLATION FEE OF THE
REFUNDABLE FARE.
..... DEDUCT NON-REFUNDABLE TAXES.
..... NO REFUND OF FARE AND CARRIER IMPOSED FEES -
YQ IF THE UTILISED OW FARE IS GREATER THAN
THE TICKETED FARE.
..... CARRIER IMPOSED FEES YQ AND YR ARE NOT
REFUNDABLE.
2.2 IF INBOUND FARE COMPONENT IS NON-REFUNDABLE.
..... NO REFUND OF THE FARE AND CARRIER IMPOSED
FEES - YQ AND YR.
..... DEDUCT NON-REFUNDABLE TAXES.
..... NO REFUND OF FARE AND CARRIER IMPOSED
SURCHARGE - YQ IF JOURNEY PERFORMED BEYOND
THE TURNAROUND/FARE BREAK POINT.
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