It is rather odd. If you happen to be in Westminster and feel like praying the logical place to pop in for a pray is Westminster Abbey. It is a sumptuous building and stands on a place where Christians have worshipped for mre than a thousand years. However it is rather odd that it would cost you £16 for the privilege. If you a frequent prayer you can save money on your prayers by buying an annual pass for just £36.
If you do not feel like having a pray but wish to reduce your ignorance you can take a short bus ride to the Science museum. However, reducing your ignorance will not cost you a penny. Entry is free.
So we learn that it costs to pray in a church but all is not lost. You can always pray on the cience museum. I am sure that no one who matters will mind.