The first £500 of interest is tax free for a 40% taxpayer with effect from 6 April 2016 as you can read here. Thr first £5,000 of dovidends are taxed at 0% from 6 April 2016 but that £5,000 is taken out of the 20% tax band, thereby leaving only £27,000 to be used against other income. No such thresholds existed prior to 6 April 2016.
If your wife was a higher rate taxpayer in the two years you had the non ISA investments, she will have tax to pay on the interest at 40% less the 20% tax deducted at source and on dividends at 32.5% of the gross dividend less the notional 10% tax credit.
I hope this helps but let me know if you have any further questions.
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