Announce a big change without losing customers

Help me announce a change to my business without losing customers.

What's changing: [e.g. moving premises, new opening hours, stopping a service, going appointment-only]
When: [date]
Why (honestly): [e.g. rent rise, staff, to focus on what we do best]
Who's most affected: [e.g. Saturday regulars, older customers who ring rather than book online]
What I can offer to make it easier: [e.g. free parking at the new place, a phone booking line, a referral to someone else]
How I reach customers: [e.g. email, Facebook, a sign in the window, text]

Ask me up to 4 short questions first. Wait for my answers.

Then:
1. A timeline: when to tell whom, starting with the people most affected.
2. A short announcement for each channel I use, leading with what it means for the customer.
3. A personal message for my most affected regulars.
4. Short, calm replies to the 5 complaints I'm most likely to get.
5. A checklist of places to update, such as my Google profile, website, signs and email signature.

Honest and warm, no corporate phrases like "exciting changes", UK English.

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