Looking to sell UK business - advisor recommendations needed

We are looking to sell a small/ish UK business. We’ve been burnt by overpromising and underdelivering brokers before and would therefore prefer a targeted off-market outreach mostly to a list of counterparties we’ve already identified. Based on feedback we received, such outreach is usually done by lawyers, former executives in the specific industry etc. (ie mostly individuals or boutique advisors). Does anyone have any experience working with such individuals/groups and if so, can you recommend anyone?