Need some serious suggestion

We started hosting services with a dedicated server on .com domain. We want to provide our services in UK as well and for that we purchased .co.uk domain. But, creating a new website and purchasing a different server is not feasible at the moment. We want to use same server for some of our UK customers. I heard that using IP method is not SEO friendly, it detects IP of specific country and redirects the visitor to that country page.

What will be the best way to use similar website on .co.uk domain with same server? We just want to show prices in local currency. We don’t want to harm seo at all because we are new in business and willing to grow in rankings.