As some others have pointed out on here to me, unless you are using your S&S isa as a kind of pension substitute and plan to have vast sums in there for retirement, it's possibly not worth sweating maxing it out if in doing so you inflict some other kind of financial punishment on yourself.
@greentricky makes sense
Yeah can hold but ideally would get it into my S&S isa before the end of march and it seems to be getting worse (for me) week on week atm.