Following is a current NOTAM for Gatwick airport.
Not sure if acceptable for SIA - however still better than sending pax to FRA!
EGKK AD AVBL AS A FILED ALTERNATIVE FOR A380 ACFT. PPR WITH 30MIN NOTICE
FOR LANDING AND TAKEOFF. MAX TKOF WT 391 TONNES
FLIGHT LEVEL FROM SFC TO UNL
VALID FROM 1249 13-MAY-2008 TO 1700 19-DEC-2008: (A1369/08)