If it’s a walk in x-ray, they are pretty quick ! I assume you’ve got the ‘form’ from the GP. I had one way back when Covid was starting – really poorly, struggling to breath, cough for six weeks etc (typical early covid signs) – doc referred me for a walk in x-ray to check there was no infection as such – literally took the form and was whizzed through the system.
X-rays can only pick out limited soft tissue issues, but it’s on the ‘path’ to a scan, which are more expensive. Cheap option first, then the scan. Unfortunately, these take time.