UK Business Seller Lead Generation

I need a steady flow of exclusive seller leads for my business brokerage here in the UK. The ideal prospect is the owner, founder, or managing director of a company valued between £100,000 and £10 million that may be ready to exit... (Budget: $30 - $250 USD, Jobs: B2B Marketing, Data Entry, Database Management, Email Marketing, Excel, Lead Generation, Leads, Sales)