Just seen that if you enter the Free Lottery draw for this Monday you get a £10 Amazon voucher if you match at least 3 numbers.
Normally the prize is just £1 million if you match all 6 numbers.
You have to register your email address but it doesn't cost anything to sign up or play, I've not had any emails since my confirmation one about 3 months ago. This is the website address free-lottery.net/