These accounts are to encourage regular savings; they require a commitment to invest each month.
Many regular saver accounts will not permit lump sum investments. Access to savings varies, some accounts may provide instant access or require notice and others may be fixed term.
Generally regular saver accounts place a restriction on the number of withdrawals allowed each year. Interest rates are variable and a minimum and maximum investment per month is sometimes stipulated, these vary from between £10 - £20 min and £100 - £2000 max.