We used a service called check-a-contract.co.uk (now called Tact) back in the day. What those guys do is allow you to upload your contract then get it checked over by a proper legal professional, but they don’t do it on their company clock. They are professional lawyers who do it after hours or on their lunch break, so you’re not liable to the firm, but you still get the benefit of a professional who checks it, uploads it, and sends it back. It looks like they might have been bought out now which is a shame.
Founder - Better Proposals
1%Stacklist Startups Are Using Tact
Tact makes high quality, professional legal services available to individuals and small and medium size businesses.
Visit the website: https://tactlaw.com/