Some of these may constitute complex instruments. BSIF was available on FT until relatively recently, for example, but it has had to be withdrawn.
FT would need to add a suitability questionnaire before allowing clients to buy complex products, and it seems like it has no plans to introduce such checks. More details can be found in the thread below.
I’d guess that’s what’s stopping FT adding GSF. It doesn’t make much sense while GRID is on the platform, considering that it seems to be traded on the LSE’s Specialist Fund Segment.
Unfortunately, FT doesn’t yet offer LSE-listed securities in currencies other than GBP/GBX, so that would rule out GRP for now as it’s traded in EUR.