I’ve been using a WordPress Plugin called OS OpenSpace Maps for quite a while that allows the mapping of trails (I use .gpx format to record the trails) onto an OS Map.
This has worked well, but in updating a blog post I came across the information that the Ordnance Survey has produced a new plugin that works with their DataHub Maps service. This is an even better service and if you’re a low-use user, you can upgrade to the Premium level subscription to get 1:25,000 scale maps.
The map can be easily zoomed and can be clicked to take to full screen size.
Here are a couple of links to help you along the way of installing and using the plugin.
The Plugin Page on WordPress – https://wordpress.org/plugins/os-datahub-maps/
Using the OS Maps API (which you have to obtain after creating an account – https://osdatahub.os.uk/docs/wmts/overview
A guide to using the plugin – https://skirridsystems.co.uk/wordpress-plugins/os-datahub-maps/