1st I am assuming you paid for your members account with a creditcard, hence worldpay. What you need to do is log into worldpay with your account number and password. I will also assume you didn't write down either. Call Wordpays help line, it can be found on the web site. Give them the info you require, they will need proof you own the account, the creditcard number and the RS name will suffice. Now armed with the account number you can recover your world pay account with the account number and the original e-mail it was registered with, do this on the Worldpay web site password recovery page. In a few minutes you will receive the new password, WRITE IT DOWN!! Now log into your worldpay account, and viola, you now have the last 3 years of transaction numbers. The 1st one is the number Jagex wants to unlock your account.