I’m no financial advisor but I did look into this a while ago. Yes you can do it but there are strict timelines and I believe you can only transfer once you own the shares and the SAYE options have been executed. I doubt that Freetrade can accomodate this right now but it’s worth asking the team in the chat?
Not FT specific but when I’ve done this in the past I’ve had to provide proof that the shares from the scheme have been exercised in the last 90 days. This was called a “Letter of Appropriation” and had to be obtained from my employer share scheme administrator.
I then informed my ISA platform that I wanted to transfer the shares and fill in some forms for them, and send them the above documentation.
Once they are in your ISA then they have the same tax benefits as any other investment in your ISA.
I would check the fees applicable to your employer scheme broker - depending on what you have planned, leaving them within the scheme might be cost effective.
I initiated transfer from provider.
I had tried two: AJ bell and HL. My preference was AJ bell, but it was during covid, and many companies had limited services and times. I needed speed to put split shares between two tax years, you can fo it as one request. Hope it helps.