Did almost exactly that (600ft cloudbase, better viz) yesterday - and I am a rusty-ish IMC holder. My excuse is that I took an instructor with me - it was meant as a refresher, and a very useful one too. Went to Cranfield and did an ILS, then back to Oxford where we planned a visual app. but the weather had failed to improve so it was an NDB app. down to minimums. All very interesting. First 10 minutes I was cr@p, but I got better - ILS went very well indeed, and I flew it on instruments down to 200ft which was very reassuring (we were actually visual at 700ft). NDB app. got interesting when I thought 189 degs was 9 degs right of the 'E' marking on the DI (instructor prodded me gently in the ribs and pointed out that this might not be correct...). Altogether a useful reminder of how easily these things can fade away.
Tim