Hello and thanks for using Just Answer.
My name is ***** ***** am happy to assist you with your enquiry.
Firstly, please note that the old documents handed to you by your Solicitor are just that, and you must rely on the Land Registry Official copies and Plan to check the current status of your property.
Likewise, to check the current status of the land at the rear, you do need to look at the Land Registry Official Copies for the land.
However, historically, I can confirm the following-
The fact the purchasers bought "as joint tenants" is just referring to the fact that the purchasers were 2 in number and they purchased the Freehold as "joint tenants" meaning that they are holding the property on trust for each other. Basically, whenever 2 people purchase a property, they can either hold the property as "joint tenants" or "tenants in common".
Therefore, the land at the rear is Freehold.
The land at the back may also have been sold several times between 1983 and last year, and you would not have been handed all this paperwork by your Solicitor as it would have not been relevant to your property. As regards ***** ***** walk through/drive, what has probably happened, is that at some stage, the land would have been registered at the Land Registry and only reflects the original joint walk through or the previous owners agreed at some point in the past to change the joint walk through.
I hope this assists and helps as best I can. At the end of the day, you do really need to look at the Land Registry Official Copies for the land at the back to check the current position, as your Solicitor will not have provided you with the full history/all the documents relating to the land at the back for the period 1945 to the current date, so you do not have the full jigsaw.
If I have helped, I would be grateful if you could leave positive feedback.