When a holding is sold, you would only last see the value(opening) from the previous close. If it's £10,325, you can't expect to realise that number because a sale is conducted during the next available auction(market) and FX changes. You might get more or less but you won't receive the same number.
The ££ are realised at trade time and this can be any time from 2.30 something to 3pm or later (it's up to winterflood, the biggest broker in europe give or take), it takes 3 working days with equity, 5 for any tracker as it's global(so if a portfolio holds any trackers it's 5 days). Money then moves out of the portfolio to your account with us then to your external bank. And that is a day for each step. These are all working days so add in a weekend and or miss 9am cuts-off and you should allow at least a week. Plan ahead for your needs
Your holdings with us are in your name, unlike unit trusts(Vanguard etc) where it is pooled so naturally they can process this a day or two sooner.