A redesign does not have to replace every working part of an existing site. Review the content management system, hosting, integrations and editing difficulties before deciding between targeted improvements and a rebuild. Ask which changes solve the current problem, which introduce new dependencies and what the business will need to maintain afterwards.
For a UK-wide website, nominate an owner for service information, prices and contact details rather than adding pages that nobody can keep accurate. Include an editing walkthrough and an agreed support route in the handover. If you later need a store, compare the dedicated Shopify and ecommerce guides below before extending a brochure-site specification into an ordering system.