England UK

Our neighbours have asked if they can use land that we own as additional
parking bay for thier use. Should we allow this (moral question), and
if so, what legal precautions / agreements (if any) are advisable?

In more depth:
We live at the road end of a short private drive, which leads to 5 other
houses. All houses have double width garages adjacent to house, with
enough space for parking in front of garage door. Separating the
properties are low fairly wide hedges, with each property owning the
hedge and land one one side only.
At some point in the past, our hedge has been partially cut down,
exposing a strip of land 2 ½ meters wide by about 3 meters long from the
garage to the separating fence. This land owned by us (undisputed) but
is not directly accessible since the remaining hedge blocks access.
However, it is directly accessible by our neighbours, and is directly
accessible from their drive.
Our neighbours have approached us and asked if they can shingle this
area (which we own) to create another parking bay for their exclusive use.
From a morel perspective, I am finding it hard to decide what to do.
One the one hand we own this land, and its part of our property, and it
would be out of keeping with other properties if we allowed it to be
used as additional parking. However, we can’t see this land from our
house (hidden by garage) so aren’t affected by its use. What is your
opinion?
From a legal perspective, if we allowed this land to be used by our
neighbours, what legal agreement should we have in place to avoid any
potential problems if we where to sell (either short or long term) –
obviously I don’t want any potential purchasers put off by any
arrangements we have made. Are there any other points that we should be
aware of?

Worth pointing out that we are not interested in selling this land.

Thanks (sorry its a long one!).

Sarah