Yeah, basically lump sum has been best most of the time, but if you're the type of person to shit the bed if you see your lump sum lose a third the day after you put it in, then drip feeding may be better for the mind
Also, regarding Isa limits. You can move the money into the Isa and keep it as cash - you don't have to invest it yet. S&s Isa's let you keep cash in there too. It just won't be earning any (Or minimal) interest though
Yeah, basically lump sum has been best most of the time, but if you're the type of person to shit the bed if you see your lump sum lose a third the day after you put it in, then drip feeding may be better for the mind
*I'm drip feeding at the moment