Find My Past have 50 free credits to new users
http://www.findmypast.co.uk/content/offers/tv-offer
I have several email addresses and if you clear your cookies it will allow you to claim credits for different emails... although this particular offer is not available to folks who have claimed free credits in the past.
Also you can get 15 free credits for British Newspapers on line if you register.
https://www.britishnewspaperarchive.co. ... t/register
With both of these you do not need to give bank account details when you register.