Looks alright, but bear in mind (if it's your money) that the UK is one of the most expensive places in the world to buy DONE3s. You would save a lot by starting in Sweden, for example. The one possible problem I see (depending on your definition of Days) is:
Code:
11N ORIGINATING EUROPE - TRAVEL ON THE LAST
12N INTERCONTINENTAL SEGMENT MUST COMMENCE NO
13N EARLIER THAN 10 DAYS AFTER COMMENCEMENT OF THE FIRST
14N INTERCONTINENTAL SEGMENT.
The normal industry definition of "days" would mean that if you leave LHR on, say, 1st December, your flight from Singapore can depart no earlier than 11th December.