Why One Big Client Is a Business Risk

Most consultancy firms in the UK start the same way: one anchor client, one main service, and a diary that looks reassuringly full. It works beautifully until it doesn't. If a single client brings in 60% of your revenue and that contract runs on 30 days' notice, you are not really running a business. You are running a probation period.

The instinct is to go and find another big client to replace them. That is worth doing, but it simply swaps one dependency for another. The more resilient answer is a portfolio: a mix of recurring work, project work, and something that earns money when you are not in the room. For a small UK firm or an independent consultant, three or four modest streams often beat one enormous one.

Start With an Audit of What You Already Sell

Before you design anything new, look hard at the last twelve months. Pull your invoices and ask three questions of every line item:

• Which services did clients ask for repeatedly? If three or more clients wanted the same thing, that is a product, not a favour.
• Which work was one-off project delivery? That is your risk exposure, and it is also a candidate for a retainer.
• Which advice did you give away for free? That is often the seed of a workshop, a template, or a paid guide.

You are looking for patterns. Most consultants find that around 20% of what they do generates 80% of the revenue, and that a surprising amount of their best material is already sitting in old proposals and email threads.

Retainers: Predictable Income That Clients Actually Value

A retainer is the fastest route to smoothing cash flow. Instead of selling a project, you sell an ongoing relationship: a set number of hours or defined outcomes each month, at a fixed fee. In the UK market, a sensible starting point for a solo consultant is £750 to £1,500 per month for roughly one day of work, or a fraction of a day spread across the month.

Keep the scope narrow and the language plain. A workable structure might include a monthly strategy call, a short written summary, and an agreed response time for ad-hoc questions. Include a notice period of 30 days, a clear list of what is not covered, and a review point at six months.

The easiest win is converting an existing client rather than chasing a new one. Say something like: "You have been booking me roughly quarterly. Would it be simpler to put that on a monthly retainer so you always have access and I can plan capacity?" Most will say yes, because predictability is worth as much to them as it is to you.

Workshops and Group Programmes: Earn More Per Hour

If you can explain something well one-to-one, you can usually explain it well to twelve people. Paid workshops are one of the most underused income streams in UK consulting.

• Public workshops: a half-day online session priced at £150 to £300 per person. Twelve attendees brings in £1,800 to £3,600 for work you have largely already prepared.
• In-house training: a full day for a corporate client, typically £1,000 to £2,500, plus travel if applicable.
• Cohort programmes: six weekly sessions for a small group, priced at £500 to £900 per person, which builds community as well as revenue.

Local chambers of commerce, professional bodies, and sector associations are always looking for credible speakers. A paid slot at one of their events is a shop window as much as a payday.

Digital Products: Templates, Toolkits and Short Courses

Digital products are too often sold as passive income. They are not passive, but they are scalable, and even modest sales can cover your software subscriptions, insurance, and accountancy fees. Think in terms of things you already make for clients:

• Templates and toolkits: a spreadsheet model, a planning framework, a set of contract clauses. Price at £49 to £249.
• Short courses: four to six video lessons with a workbook, priced at £150 to £400.
• Paid newsletters or memberships: monthly insight plus a live Q&A, at £15 to £40 per month.

Your existing client list is your first market. Sell to people who already trust you before you attempt to attract strangers through search or social media. Be honest about the effort: a decent toolkit takes a week to build properly, and you should expect it to sell in single figures per month at first.

Sequencing It Without Breaking Your Delivery

Do not launch four new streams at once. Pick one per quarter, and protect your billable capacity while you test it. A simple sequence works well: convert two clients to retainers, then run one paid workshop, then package one template, then consider a course.

Watch the practicalities too. Additional income can push you towards the VAT registration threshold, so keep an eye on rolling twelve-month turnover. Review your mix every quarter and drop anything that takes more time than it returns.

Diversification is not about doing more. It is about making sure that if your biggest client walks away on a Tuesday morning, you still have a business on Wednesday. Start with the smallest, simplest change, and build from there.