Basic/instant sell order limits

I know that limit orders have a set 25k price limit per transaction however I was wondering if the same applied to basic and instant sell orders.
If the market price and the amount of stock I held totaled to £1 million, then would selling all of that stock require me to do 40 seperate transactions or would I be able to sell all my stock in one transation for the full price?
Just want to make sure as I plan on selling my portfolio and I don’t want to risk losing money due to a low price limit per transaction.
Just to clarify, if the current prices indicated that one of my stocks was worth £35k and I were to sell 5 then would I need to sell them as fractional shares to recive full payment or can I sell them all in one button push for the full price?

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