Looking to invest £5? Or £5m?
If you're coy with providing numbers you'll make for a crap investor (in terms of attracting the right deals).
You asked for advice.
Advice: Decide your brief - amount you want to invest, sector preferences, geographical location, attributes the business needs to have etc etc. And make that brief public. Or hire a buy-side broker.
There's a big difference between a £100K distressed marketing firm in Devon and a £10m Aberdeen based parts supplier to oil industry. Decide what you really want before you go looking for it. And what you can afford.