I'm sure you won't run into this problem, but the Home Office recently kept my sister's passport for 8 months. She is a Canadian citizen married to an Italian citizen, and has lived in the UK for 7 years. When she applied recently for a renewal or whatever of her status, they sent back a note asking her to provide proof that her husband was exercising his EU treaty rights (or whatever it's called). All in all, they had her passport 8 months, which seems to me terribly incompetent.