Easy £20 here from Zopa...open the account...add a fiver or so and make 3 card transactions (literally pence) on the virtual card...we then get £20 each.
No switching required and its actually a great account with fab savings rates.
Use my referral link to open a Biscuit bank account and make at least 3 card transactions within 30 days, and we'll both earn £20. T&Cs apply. www.zopa.com/mgma?referralCode=48088510c18dd5f2d1b2