Savings advice

[midden]

Although there is a £2 the Santander 123 account pays 3% if conditions are met.  Have to put £500 in to it each month but that can be 100 quid put in and out 5times blah blah blah.  It also gives cash bavk on certain bills paid from it.  So I use my account as savings but transfer the £500 in to cover bills on DDebit which then gives me cash back which more than covers the £2 charge.
If she pays tax on her savings an isa paying 2.5% would be better, opening with max allowed before April then putting rest in after April.