Santander has today (December 2nd 2011) launched a new range of Fixed Rate Postal Isas to benefit both new and existing customers.
The bank can offer a rate of up to 3.5 per cent for its two-year product, or three per cent for the one-year Isa.
Not only can savers put their allowance for the current tax year into the account, but they can also transfer in savings from previous years' Isas.
Matt Hall from Santander said: "Fixed rate Isas offer certainty of return with the advantage of earning the interest tax-free and therefore continue to prove popular with savers looking to lock in their cash."
The offer is available from any branch of the bank or over the phone, but is strictly limited, so anyone interested may wish to act now.
Santander also highlighted its Flexible Isa with a minimum interest rate of 2.81 per cent as a good alternative.
More than 32 million customer accounts are managed by Santander from 1,400 branches nationwide.