Fields which are run as a charity are able to access funds that non-charities cannot (e.g. through some trusts and foundations). Guidance on establishing a charity is available from the Charity Commission.
The GrantFinder website holds information on thousands of grant-giving opportunities and features a search facility so that users can narrow down the options to those that best fit the project for which funding is being sought. Users need to register, which gives 90 days’ free access to the site. Full instructions are given on the website.
County Sports Partnerships are a useful source of information regarding funding opportunities. You can find your local CSP on their website.