Originally Posted by PhilH
The problem for me is that I collect miles on my BD card, not KF. Therefore to OLCI I have to book on the website

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PhilH, are you sure about that? The
online FAQ on OLCI states
What is Internet check-in?
Singapore Airlines is pleased to present our Internet check-in service, a convenient way to check in for most of your flights. You may check in for a flight if you have a confirmed booking with Singapore Airlines and have a valid ticket. Internet check-in is available for all booking and ticket types.
and
Who can use Internet check-in?
Internet check-in is available to all Singapore Airlines passengers with the exception of the categories of passengers below:
- Passengers under the age of 12 who are travelling alone (unaccompanied minors)
- Passengers under the age of 17 who are travelling with passengers under the age of 17
- Passengers who have indicated for special or medical assistance to be provided
- Passengers who are travelling with infants
- Passengers travelling in a group of 10 or more
I don't see any exclusion based on FFP and how you booked. The OLCI page only asks for the name of the passenger, the booking reference and SQ flight details.
Perhaps you could check with the UK SQ reservations, just to make sure, before making the booking?