Hello I am a solicitor with over 15 years experience. I will try to help you with this.
i am awaiting your response
It sounds as if you have been badly treated by the police here. There is no legal obligation requiring you to talk to the police if you do not want to. They also can not detain you (even in your own kitchen) without a lawful reason, ie that they suspect you of an offence and are arresting you. You should seek legal advice, you will not get legal aid for this and will have to pay privately. From what you say you are not guilty and should fight the case. You should also consider making a complaint about this conduct but it is likely that the solicitor you instruct to defend you will want to out that off until after the criminal case has concluded.
You will also need the other people who were there to be your witnesses to support your account.
The maximum sentence for obstruction is a low level community order although nearly always it is dealt with by a fine. A findig of guilt would lead to a criminal conviction though so you need representation.
I am fittin gthis answer around other commitments this evening and it is possible that there may be a delay in my replies to you.
bmany thanks. can i come back to you if i have any queries. bur i will be retaing a solicitor. Given my unblemished record I need to fight this to the hilt. Is it advisable to retain a barrister