Yes, you can withdraw money from your Regular Saver pot anytime. You can also withdraw and replace money within the same monthly allowance period. However, if you withdraw more than £300 in a month, you’ll still only be able to deposit up to £300 that month. 

For example, if you have £1,000 in your Regular Saver pot and withdraw £500 in a month, you’ll only be able to replace up to £300 that month. This means you’ll have £800 left in your Regular Saver pot.