The Halifax saver looks good but you can only put in £100 to open, then you are allowed to feed it for 12 months.
So
Open from between £10 - £100.
Pay in any amount from £10 to £100 each month by standing order
Kids' Regular Saver example - If you save £50 each month, you'll earn £18.97 gross (£15.18 net) interest after 12 months.
So with £100 per month you may get £37 after a year.
Craiginuk said he has £100 per month to invest, at present a saved portion just sits in with an isa but was hoping to earn a bit of interest on it for them.
So I assume he has a lump sum from the ISA to invest for them first.
With the lump sum in a 123 trust @ 2K they would earn around £55 per year every year not 6% compounded for the first year..
+ you can take it out when ever you want.