Fairly sure they're just randomly generated strings, although it would be cool if they were some secret coded message. Perhaps it's Honey trying to communicate from wherever Numbers & co. sent her after the revamp! 
rach74 wrote:
what VIP letter codes? so please share with D69 and me lol
Occassionally on your invoice you'll see a VIP code, which, if used within a short period of time, gets you £10 off when you spend over £50. Not sure what triggers it, as I've had expensive orders not get one, and wee £2 orders get one, some times it'll be three in a row get it and others I'll not see one for months. you can also see them on the order details in your history - https://www.lovehoney.co.uk/your-account/order-history.html - so if you've not been checking the invoices packed with your order, you can see the code (if you got one) in there. They seem to expire after a fortnight or so, so would have to be on a relatively recent order.