How can one gain access to isolated pockets of open access land?
<p><strong>What rights do members of the public have to access isolated areas of open access land, if any at all?</strong> That is to say areas of access land which are (i) not crossed by and do not adjoin any public rights of way or (ii) areas of access land which are separated from all other nearby access land and rights of way by excepted land. Examples of such land can be found in these locations:</p>
<ul>
<li><a href="https://streetmap.co.uk/map?x=396089&amp;y=496413&amp;z=115" rel="nofollow noreferrer">Example 0</a></li>
<li><a href="https://streetmap.co.uk/map?x=260789&amp;y=319463&amp;z=115" rel="nofollow noreferrer">Example 1</a></li>
<li><a href="https://streetmap.co.uk/map?x=364715&amp;y=514739&amp;z=115" rel="nofollow noreferrer">Example 2</a></li>
<li><a href="https://streetmap.co.uk/map?x=371571&amp;y=568218&amp;z=115" rel="nofollow noreferrer">Example 3</a></li>
<li><a href="https://streetmap.co.uk/map?x=377520&amp;y=485554&amp;z=115" rel="nofollow noreferrer">Example 4</a> - Notice the railway line which isolates the western part of the access land</li>
<li><a href="https://streetmap.co.uk/map?x=412221&amp;y=488820&amp;z=115" rel="nofollow noreferrer">Example 5</a> -  Notice the track leading to the road is <strong>not</strong> marked as a right of way</li>
</ul>
<p>As far as I can tell, no specific provision is made for cases such as this in the <a href="https://publications.parliament.uk/pa/cm199900/cmbills/078/00078--g.htm" rel="nofollow noreferrer">Countryside and Rights of Way Act 2000</a>:</p>
<blockquote>
<p>“means of access”, in relation to land, means</p>
<p>(a) any opening in a wall, fence or hedge bounding the land
(or part of the land), with or without a gate, stile or other
works for regulating passage through the opening,</p>
<p>(b) any stairs or steps for enabling persons to enter on the
land (or part of the land), or</p>
<p>(c) any bridge, stepping stone or other works for crossing
a watercourse, ditch or bog on the land or adjoining the
boundary of the land.</p>
</blockquote>
<p>This appears to make the implicit assumption that the relevant access land will be adjacent to some form of right of way.</p>

<p>If, as your question stipulates, there are no public rights of way (such as an easement) to the enclaved public area, then you must gain permission from the private landowner to cross their land before accessing the public area.</p>

<p>If it's possible to fly over the private land using something like a helicopter or a plane, as long as you fly high enough, That wouldn't require permission.</p>

<p><strong>What rights do members of the public have to access isolated areas of open access land, if any at all?</strong></p>
<p>It depends as it's at the discretion of the private landowner(s).</p>
<p>According to the <a href="https://www.ordnancesurvey.co.uk/documents/25k-raster-legend.pdf" rel="nofollow noreferrer">Ordnance Survey's</a>* 1:25k legend:</p>
<blockquote>
<p>Access land portrayed on this map is intended as a guide to land normally available for access on foot, for example access land created under the Countryside and Rights of Way Act 2000, and land managed by National Trust, Forestry England, Woodland Trust and Natural Resources Wales. <strong>Some restrictions will apply; some land shown as access land may not have open access rights; always refer to local signage</strong>.</p>
</blockquote>
<p>I note that example 1 is in the Snowdonia National Park, examples 2 and 4 are in the Yorkshire Dales National Park, and example 3 is in the Northumberland National Park so it's quite possible there may be local signage allowing permissive access that has not been captured on the maps.</p>
<p>I also note that in example 4 a bridge crosses over the railway line allowing access to the western side of the tracks from the eastern parcel (it is unnamed and to the east of the words Scale Gill Bridge).</p>
<p><a href="https://i.stack.imgur.com/K7B53.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/K7B53.jpg" alt="unnamed bridge" /></a></p>
<p>Example 5 is not within any national park, and according to Street View the fenced track to the south is gated with no obvious local signage.</p>
<p>*The Ordnance Survey's <a href="https://www.ordnancesurvey.co.uk/governance/public-task" rel="nofollow noreferrer">National Geographic Database</a> is the primary source for these types of maps.</p>

england-and-wales traffic easement