An Environment Agency investigation has closed with Mettis Aerospace committing more than £1 million through a legally binding enforcement undertaking after a spill from its Redditch metals site killed around 1,000 fish. The overflow of a process tank and weak containment allowed a caustic solution containing sodium aluminate to enter an unprotected surface drain and a nearby watercourse, according to Environment Agency figures.

Rather than pursue prosecution, the regulator accepted a package intended to repair harm and prevent a repeat. It includes £504,240 for on‑site infrastructure, staff training and certified management systems; £111,268 for the initial clean‑up; £9,324 for the Agency’s investigation; £13,026 for assessing the undertaking; and £7,000 as loss‑of‑amenity compensation. In total, the commitments come to about £1.024 million.

Local projects will see tangible gains. Four organisations will share £379,500: Redditch Borough Council (£180,000), Birmingham & Black Country Wildlife Trust (£139,500), Forge Mill Needle Museum (£55,000) and Worcestershire Wildlife Trust (£5,000). These funds can support habitat works and community engagement led by trusted NGOs, keeping benefits close to where the damage occurred.

Enforcement undertakings are voluntary proposals from companies when the Environment Agency has grounds to suspect an offence. Introduced under the Environmental Civil Sanctions (England) Order 2010 and related regulations, they become legally binding if accepted and must tackle both cause and effect-funding restoration and improving compliance.

The Agency states it will prosecute the most serious cases, but undertakings can deliver faster environmental improvements by directing investment into the systems that prevent spills. In Redditch, that means stronger drainage and bunding, high‑level alarms and overflow controls, and training that embeds good practice across shifts.

The spend profile matters. Roughly half is dedicated to on‑site prevention, just over a third to community projects, and the remainder to clean‑up and regulatory costs. That balance reflects the approach championed by the Wildlife Trusts and river groups: fix the source, restore the habitat, and monitor for recovery.

The root cause here-an uncontrolled tank overfill and inadequate containment-is avoidable. Operators handling high‑pH solutions can cut risk with secondary containment around process tanks, automatic isolation on surface drains, interlocked level sensors, routine maintenance and regular refresher training. The Environment Agency notes that robust management systems and certification help sustain standards over time.

For residents, the test is how quickly the watercourse rebounds. Donations to the Wildlife Trusts and the council can enable riparian planting, in‑stream refuges and citizen science-approaches used by NGOs to speed the return of invertebrates and fish. Transparent reporting on the undertaking will help communities track progress.

Today’s outcome does not end scrutiny. The Environment Agency will audit delivery of the undertaking and retains the option to prosecute if terms are not met. For Redditch, success looks like fewer incidents, better‑protected drains and a healthier, more resilient local river.