I wouldn't worry guys. The majority of people that bought Reading Festival tickets from See Tickets (19th March) still have not recieved their emails.
See have "issues" with their email system to say the least. If you just want to check give them a ring.
Their cheap number that they dont like to advertise is : 01159129240
They'll tell you all the orders you have and confirm it. You can also ask for your reference number and a replacement email.
Though often the replacement email never arrives, but go to their order checker and put in the reference number and you should get an email within a few minutes then.
Hope that helps someone anyway, i know how you all felt when i didnt recieve any emails. Theres always that niggling doubt until you find out for certain.