£250 a month: what actually earns interest
Lloyds' own illustration says £250 paid in the middle of each month into its 6.25% fixed Club Lloyds Monthly Saver produces £3,093.75 after 12 months: £3,000 paid in, £93.75 interest. The first £250 earns roughly eleven-and-a-half months of interest; the last, roughly half a month. That £93.75 is 3.125% of eventual contributions, but 6.25% is still the quoted annual rate on each pound while it is on deposit. Calling 3.125% the account's 'true AER' would be wrong.
The 7% comparison scales first direct's £136.50 illustration for £300 monthly by 250/300, giving approximately £113.75 for £250 paid on the first of each month; daily timing and rounding affect actual interest. The £69 lump-sum figure is £3,000 × 2.30% for one year, at the variable Nationwide Flex Instant Saver rate checked on 27 September. These are different cash-flow situations, not a like-for-like product ranking. Both Nationwide products require a Nationwide current account; the instant saver is a concrete illustration, not a claim that 2.30% is the market's best easy-access rate. For further examples, see our easy-access savings comparison.