Quote from Money Saving Expert:
If you are locking in, make sure you know the tax implications of how you take interest. Accounts paying interest 'at maturity' do so as a lump sum, which could take you over your personal savings allowance (PSA) for the year it matures – meaning you'd pay some tax on the interest. Alternatively, accounts that pay interest out to you monthly or annually might help keep you under your PSA as it's spread across tax years. Yet interest doesn't compound in this case.
So - basically I've got £150,000 to lock away (ideally for 3 years). I earn £30k per annum myself so I'm a normal tax payer.
On MSE I can access rates of 5.95% and interest annually or at maturity.
What would be the best option for me?
I'm really confused. 
Thanks in advance. 