Problem with Bulk buy discounts for Raffle tickets in UK

I set up a Raffle on the site and it is going very well, however I have been contacted by a person raising an objection to my offering bulk buy rate. My pricing was set at £5 for 10 tickets, £10 for 25 entries, £20 for 60 entries and £30 for 100.

Apparently what I have done is unwittingly broken the UK law for such raffles. Each ticket or entry into the raffle must cost the same amount for each chance of winning.

I am intending to restructure the pricing system and contact the people who have purchased more than £5 worth of tickets and explain my innocent mistake.

Were you aware of this legal point?

Also whenever I go onto the Rallyup site to check the number of entries I put my password in and tick the 'remember me' box. It doesn't work as when I return next time I have to fill in the password once again