Thank you for your replies. My e-ticket does start with 607.
However what is worrying is I did phone EY MAN helpdesk earlier this evening and the girl said she had never been asked that query. She had to check with her supervisor and came back and told me that if the carrier charges then I would have to pay and I am bound by their weight rules as well (the weight rule of 20kg is not a problem for me).
However, when I view the booking on Flybe website, it gives me the option to select seats and if I click on that it adds £26 to the shopping basket. Then if I click add bags, it tells me bags have been added but the shopping bag amount stays at £26, then when I click continue (only doing this to try and get a total cost) it doesn't let me go any further and there is an error message at the top of the screen which reads "you cannot remove bags that have been added"
I will see if I can get a contact number for Flybe at ABZ tomorrow.
Thanks for your help.