The problem is that if you are sniffy with the police, they will take that as a hint that you aren't totally innocent. "How does he know to resist our attempts to 'help establish the truth' / 'fit him up'? Only guilty people bother to worry about their rights." On the other hand the prospect of your saying something that will generate further enquiries may be significant.

I suspect you may be best off with the later advice and seeking out a solicitor NOW - before they are at your door.