What repair would mean on this ground specifically

Repair costs more than prevention, and this is what it would take here

Prevention moves a fence at the planning stage. Repair takes over when the fence stayed where it was, and it runs expensive, slow and uncertain in exactly the proportion that prevention runs cheap, fast and reliable. The general specification is on the standard. This page is only the part that is specific to this coast.

Why this page is marked partial, in its own first screen. A replacement colony patch has to go somewhere, and siting it needs the one thing nobody has: a walked boundary and a colony polygon. Until then this is a specification with no location, and publishing it as a plan would be the same overclaim the rest of the site exists to avoid.

What is specific to here

Element	On this ground
Where	Spend the leverage on new ground near the footprint, larger than what was lost and permanently protected, rather than on the exact ground beneath the camp, and restore the footprint at teardown as well. site not identified
Substrate	Flat, open aspect, bare or sparsely vegetated gravel or shingle, with crushed shell spread on the surface, which measurably increases uptake. On this coast that substrate is also ringed plover ground, so the patch has to be sited against the Tier 4 list rather than only for the terns.
The season it cannot touch	Kría arrive early to mid May, lay late May into June and fledge late July into early August. Every works window is therefore September to April, with no exceptions and no "quiet corner of the land" version of it.
Vegetation control	Scrape mechanically to bare ground at least every five years and strim between. Dense vegetation invites gulls, and gulls displace terns, and this coast carries great black-backed gull, CR, on the same list.
Predator exclusion	Anti-predator fencing designed in from the start, plus chick shelters. The predator that matters here is American mink, which is on the Tier 5 list, so the fence and the removal work are the same project, not two.
Social attraction	Decoys plus a solar-powered audio lure. This is the tool that actually pulls birds onto new ground; demonstrated on Caspian, roseate and Chinese crested tern projects.
Monitoring	The same team, annual counts and productivity, five years minimum. A count in year one is a press release; a count in year five is a result.

What to expect, honestly

Recolonisation typically runs one to three years, and comparable projects have drawn common terns the season after completion. Sustained breeding is a second result that follows the first. Initial occupation does not guarantee it, and local food supply rather than habitat is often what limits it. On this coast that caveat has teeth: breeding success has been persistently poor on the south and west since the 2005 sandeel collapse, which is also why a west-Iceland colony still producing chicks is doing something the surrounding landscape is not.

A replacement patch is a real remedy and a partial one. Both halves of that sentence stay.

On costing it. Hold the figure until a survey comes back. Predator fencing dominates capital cost and scales with area, so a number invented early lands either indefensibly high, which kills the proposal, or too low to do the work, which is worse. Scope it with the local institute, after.

And a replacement patch is a thing to be proud of. Built well, it is new protected ground that would not otherwise exist, with five years of counts to show whether it worked. Any producer who funds one has done something no certificate can buy.