The queen mother was born Lady Elizabeth Angela Marguerite Bowes-Lyon on August 4, 1900. Lady Bowes-Lyon then became the queen consort. Queen Elizabeth, wife of George VI, became the queen mother. In the years since, she has actively participated in many royal and state functions and remains very popular with the British people. In looking over your website material I would suggest only two things.
Postage is reasonable.
After all, they are the post office. I have bought booklets dating back, I believe to 1995 and have even ordered the next prestige booklet, not due until next year. The USPS has a nice international catalogue and adds a few dollars to the price of the prestige booklets. They have large numbers of past dealings in parenthesis and are easily spotted. I would also be fearful of really old stamps purchased this way because of the difficulty of examining their condition.