Can pest controllers do the proofing work too?

Most do. Many include basic sealing in a treatment package, with larger jobs (re-pointing, soffit repairs) quoted separately. Always ask for an entry-point report after any rodent treatment — it's the difference between a one-off fix and a recurring problem.

Is expanding foam enough to block mice?

No. Mice chew through expanding foam easily. Use it as filler only, then back it with stainless wire wool or metal mesh.

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12 Common Ways Pests Get Into Essex Homes (And How to Block Them)

The cheapest pest treatment is the one you never need. Most rodent and wasp infestations in Essex homes come in through five or six predictable entry points — almost all of which can be sealed in a Saturday afternoon with materials from a local merchant.

Here's the walk-around inspection a professional pest controller does on a proofing visit, so you can run it yourself.