Stop being the bottleneckon every quote, proposal, and senior-engineering decision.

The four differences worth caring about are laid out in full on this one-pager. For a business, the feature fight between the two chatbots is the wrong place to start. Once you are on a governed, commercial deployment, those four differences matter for a specialist firm. First, a workspace, not a chat window: Claude can work directly on the folders on your machine, where ChatGPT's access to your local files is more constrained, so you lose the copy-and-paste tax on every job. Second, automation that does the work rather than reminding you to: Claude's scheduled tasks fire a full working session with access to your files and tools, where ChatGPT's scheduled Tasks are more limited, so one produces the report while you sleep and the other just nudges you. Third, projects that scale past the window: Claude Projects take large files with no limit on how many, and pull in the right parts automatically, so your firm's standards, past jobs and templates can sit behind the model without being trimmed to fit. Fourth, data governance you can point to: on the commercial tier you get a written no-training position and controlled retention, so when a client or an acquirer asks where your data goes, you have an answer on paper. Our own view, and we are not neutral, is that Claude on the commercial tier is the stronger bet. The bigger win, whichever you pick, is getting the deployment governed so your hard-won know-how does not leak into a model your competitors might use. Book a 30-minute Discovery Call.

Two questions decide it: how often a task happens, and what it costs if it goes wrong. We map every task on a simple frequency-against-risk grid, so the daily low-risk work gets automated first, the high-stakes work stays gated or human, and the rare trivial work is left alone. See When to automate for the full lens.

Yes. The engineer doing the override pass on every Headroom deliverable sits on a British Standards earthing committee, chairs an industry earthing and lightning protection working group, and contributes to UK pipeline standards. Reading the working stack at native level is the baseline, not the upsell.

A custom AI agent does the first-pass technical drafting. The chartered engineer then reviews, annotates, and signs every override on the page itself. The deliverable shows both layers, the agent's first pass and the engineer's corrections, side by side, visible to the client. The engineer's reasoning is not hidden under the bonnet. It is the credibility surface. A normal HV bid response shows only the final text. Ours shows the working.

Bonus 2 (the Quarterly Score for Your Fellow Directors) is built for exactly this. Every three months we write a one-page score in plain money language, walk your board through it, and frame the engagement as asset formation rather than expense. If your directors will not approve £2,100 to £3,750 a month against a documented reduction in senior bottleneck and a documented uplift in firm value at sale, the conversation we need to have is different from the one we're having now.

You keep the senior-knowledge agent kit, the standards notes, the quarterly board scores, and the audit trail of every override produced during the year. The system runs in your firm without us. We are hired to make ourselves unnecessary, not to embed permanently.

Greycell can run three Headroom engagements concurrently. The first three owner-managers to sign get the early rate. We will be transparent in your Discovery Call about which engagements are running and where, subject to NDA on specifics. We do not take two firms in direct head-to-head competition at the same time.

Yes. The lead engineer is currently delivering £1.5m a year of design services into four major hyperscale data-centre operators and is in transition to take a Prime Client Engineer seat at one of the world's largest colocation operators. The override-quality bar inside Headroom is set to that audience, not a generic procurement audience.

Once three owner-managers have signed at the early rate of around £2,100 a month, the rate steps up to around £3,750 a month for everyone after. Same engagement, same deliverables, same guarantees. The step-up is not arbitrary: by then we will have published case studies from the first three engagements, which the standard rate is anchored against.

You do not need one. Flow 5, the two-hour survey, maps the five jobs your firm runs on without any live quote to anchor on, so it is the right first step either way. If you do have a quote stuck on your desk, bring it to a Discovery Call and we will work through it with you. For larger firms, the Bottleneck Audit goes deeper with five to eight interviews across the firm.