Funny you should mention ETFs, because I've recently been taking a look at them. The Ishares IFTSE100 in particular (ticker ISF). This is the FTSE tracker, of course.
Trouble is, it daily trading volume @ between 400K and 6 million is pretty low - too low to be a better bet than futures.
What it might be good for though is longer term position trades and I might dip my toe in for that reason. I have a self select ISA which I lost interest in when I started seriously trading US indices and its been at 100% cash for yonks. So perhaps I will switch to 100% ISF next time the market hits a major bottom and return to cash again at the peak (nice dream!).
Some of these sharp bear market rallys give 15 to 25% and is tax free in an ISA of course.
I'm also keen to hear from anyone who is using ETFs.