If a potential customer reaches out and hears nothing for hours or days, the chance of winning that work drops fast. Not always immediately, but enough that the delay starts to matter.
For many UK businesses, the problem is not a lack of enquiries. It is what happens after the enquiry arrives.
The lead comes in. Someone sees it. Someone else is supposed to reply. The message gets pushed aside. By the time anyone follows up, the prospect has already spoken to another provider or moved on.
That is how opportunities go cold.