Thank you for that explanation it, makes sense......so its how a broker/dealer sets up his platform?.... in other words IG could make it possible if they wanted to...as a punter, I dont care where the order is stored, as long as it is noted and released into the market at open...I generally do my "thinking" after the market has closed assessing the day's price action on my open positions etc and plan the next days move/s...so to be able to place or alter existing Limit orders outside market hours is really helpful (to me)
Anyhow JohnnyRy thanks again for your reply