Thank you, Sirius, for your helpful reply, and sorry for mixing up the terminology.
My husband is Belgian. He came to the UK to work in October 2010, and has been living here continuously since, exercising his treaty rights. He just applied for, and received his permanent residency card, and has been living in the UK for 6 years now. He can apply for citizenship now, but we were told that if he did, it may jeopardize my application for next year, as he would switch to being recognised as a UK, instead of EU sponsor?
The current plan is for me to apply for my permanent residency next year, either in May or October, I am confused as to when. Once I safely do this, I am no longer dependent on his status, and my husband should then apply for British citizenship and so should I, if this makes sense?
Any advice would be great, thank you.