yeah, this is why it isn't a good thing for your T to cross your boundaries like this. it can make you feel beholden to her. i'd return the vacuum to her and tell her it was nice of her to offer it but it doesn't feel right. you can always use your husband as an excuse saying he wasn't comfortable with you receiving it. it doesn't matter that you've used the vacuum.

i've never had a T give me a large gift but i did have a T who i was in a dual relationship with. she was my T and then was also teaching an artist's way class. she only had a few students and when everyone started dropping out for various reasons she tried to give me a total guilt trip when i told her i'd need to drop too. she tried to say she'd started the class for me. it was so inappropriate of her to say & do that. i was like wtf? i never asked her to do the class for me. she listed on her website that she taught those classes. i dropped therapy with her not longer after that due to some other reasons.

edit to add: i didn't see the part about it costing 20 pounds/$31 so i didn't realize it was actually a small purchase. can you really buy a brand new vacuum for that little though? i don't know. since you have posted other things questioning your T's boundaries, one that made me super concerned for you, i think i'm going to stick with my initial thought that it is best returned. if this were a one-time thing and your T otherwise had great boundaries then it probably wouldn't concern me. i know you are really attached to your T but i am not sure how healthy she is for you.