Anyone recommend a good portable loo seat

[paddypoopants]

I've just potty trained ds (2.5) and he has done really well but I need to get a folding kids loo seat to take out with me. He won't let me hold him over the loo as he's terrified he's going to fall in and I've been carrying the potty around with me but it's a PITA. There seems to be a few designs about but I'd like to know which one is best before I waste/spend my money.
Thanks.

We use this one

It also works as a potty with liners if there is no toilet available and the whole lot ids fairly small and portable, would easily fit under a pushchair or in a largish changing bag.

Liners are expensive though... so much so that we had ten and have only used about 3 as I was determined not to have to buy any more!

Thanks fizzpops- I've just had a look at the link and it looks good- especially as you can use it as a potty as well as a seat. It's better than the other ones I was looking at.