Both mine have a kids saver with Halifax, but I opened the first one in 2021 so I have no idea if that’s still the best option interest-wise!
We have Junior ISA with vanguard and junior SIPP with fidelity. was not aware of junior sipps at all, but the govt tops up 25% and with compound interest, by the time they can actually withdraw money, it was a no-brainer.
We just looked into this and best interest rate is currently 4% on a junior ISA with NS&I which we were able to open online.
Interested to see what others have done. The ISA options were not that attractive in July when our daughter was born so just opened a savings account with RBS. Going forward hoping to open an ISA and split the monthly savings between the two with ISA to hopefully remain untouched until she is 18.