As a business owner you can claim allowable business expenses for:

advertising in magazines, newspapers etc.

direct mail/leaflets

bus advertising

facebook ads

google ads

radio ads

remarketing

vehicle signage

website costs

trade journals

professional organisations eg. FSB

You cannot claim for:

entertaining

hospitality

gym memberships

payments to political parties

donations to charity, but you may be able to pay for sponsorships

There may be variations depending if you are a sole trader or limited company.

Always check with your accountant.