1. Dear *****, you can sue the estate agency here for damages for trespass and for removing your property. In law, it is a trespass to come onto someone else's property, such as their parking space and to remove anything of value, such as the parking post, without lawful authority. So, here you can claim compensation from the estate agency for their actions in allowing this couple come on your parking space and remove your parking post. Additionally, you can sue the couple who did so as well, as they parked in your parking space without lawful authority and they will be taken to have trespassed as well.
2. You can represent yourself or you can get a solicitor to represent you. A solicitor's letter to the estate agency claiming compensation would be a first step towards claiming money damages from them. If the estate agency don't then pay up, you can take them to court for damages.
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4. If you can reach some acceptable concilatory settlement agreement with the estate agency, I would recommend this approach. You are better ensure that it is not repeated rather than seeking to obtain a lot of money. So, you should start by making clear that you own the rights to the parking space and it was your pole that was there, which was removed. Attempt to get the estate agency to see they have erred before you get into an emotional dispute with them. So, you should begin by explaining the situation and attempt to reach some form of compromise.
5. That should be your minimum take away from the meeting with the estate agency. Essentially, you need to start by laying down that it is your parking space and if you can get some compensation, then that would be a plus.
6. That is great, Mandy! Glad to see you got the problem resolved. Please Accept or Rate the answer as this is the manner in which the Expert gets paid by the website.