There is no one answer to this question as it depends on your specific circumstances and how much you are willing to spend. However, generally speaking, blogging is not free to operate in the UK.
There are a number of costs associated with running a blog, including hosting fees, advertising fees, and the cost of bandwidth. In addition, you will need to factor in the time you spend on your blog writing and editing content, as well as maintaining a social media presence.
If you are willing to put in the hard work, then blogging can be a lucrative way to make money online. However, if you are just starting out, it may be more cost-effective to focus on other online marketing strategies first.