Warming up
Transactional email API
1,170 UK consulting firms name London on their website and publish an email address, as of September 29, 2026. W1 is the busiest postcode district among those that publish one, and Google Workspace handles email for 12% of them.
Searching is free. You only spend allowance when you export.
772 of the 1,170 publish a postcode. Among them, W1 leads with 84. Districts with fewer than five companies are left out.
| W1 | 84 (11%) |
|---|---|
| EC1 | 74 (10%) |
| WC2 | 63 (8%) |
| EC2 | 43 (6%) |
| N1 | 32 (4%) |
| SE1 | 18 (2%) |
| WC1 | 16 (2%) |
| E1 | 16 (2%) |
| E14 | 16 (2%) |
| SW1 | 14 (2%) |
| SW6 | 13 (2%) |
| EC3 | 11 (1%) |
Every company here publishes an email address. These are the other routes and signals their websites carry.
A second route for when email goes unanswered.
Growing firms buy more. A useful first filter.
Who hosts their email decides which spam filter reads your message. What their site is built on says what else they already pay for.
| Google Workspace | 139 (12%) |
|---|---|
| Microsoft 365 | 101 (9%) |
| Self-hosted | 37 (3%) |
| Hostinger | 14 (1%) |
| Other or unknown | 879 (75%) |
Read from each domain's public MX record. If most of your list is on one provider, warm up a mailbox on that provider first. Filter by provider in the lead finder.
Share of these companies whose homepage loads each technology. Google Analytics is left out because nearly everyone runs it.
315 of them (27%) state a founding year on their site. This is how those split.
| Before 1980 | 7 (2%) |
|---|---|
| 1980 to 1999 | 32 (10%) |
| 2000 to 2009 | 79 (25%) |
| 2010 to 2014 | 62 (20%) |
| 2015 to 2019 | 76 (24%) |
| 2020 or later | 59 (19%) |
What we have learned about emailing consulting firms. The numbers above tell you how many there are; this is how to get a reply.
Consultants sell expertise, so they respond to evidence and a sharp point of view. Show you understand their niche, keep the ask small, and avoid anything that sounds like it could be sent to any firm.
Hi [first name], read [firm]'s take on [topic]. The point about [specific point] matches what we see with our own clients. We help boutique consultancies start conversations with firms that fit their niche. Open to comparing notes?
Replace the bracketed parts per company. In a Warmerly campaign they fill from the lead's own fields.
Monday morning or Friday afternoon, when consultants are off client site and catching up on their own pipeline.
1,170 UK consulting firms in Warmerly's database name London on their website and publish an email address, counted on September 29, 2026. A company is matched when its site text mentions London, the same way a city search works in the lead finder, so a firm based elsewhere with a London office is included.
Google Workspace runs email for 12% of them, followed by Microsoft 365 at 9%. It is read from each domain's public MX records. It matters for cold email because Google and Microsoft filter differently, so a sending mailbox on the same provider as most of your list is worth warming up first.
By full-text search over each company's own website text, the same match the lead finder uses when you type London into the city filter. It is broader than a registered address: 772 of these companies publish a postcode, which is where the district breakdown on this page comes from.
Yes. Searching the database in Warmerly is free, and you see the same count as this page before spending anything. Exporting or adding companies to a campaign uses your plan's monthly lead allowance. Every result is a business contact route the company publishes itself, and any company that has asked to be removed is excluded. This page shows totals only, never individual companies.
Filter them by size, founding year, technology and hiring, see what each record holds, then send from warmed-up mailboxes in the same tool.
