A lot of it is carbonation and temperature. I reckon it's pretty impossible to approximate the "experience" without a handpump and cellar temps. Try as I might. I've gotten close, but never nailed it.
Galbraith's beers are very very lowly carbonated - even at the low end for cask beer. i like it this way. When the beers are really good they are amazing, the best in the country for me.
In saying that, I felt awful the last time i was there- - I returned a beer (and I'd returned one there almost exactly a year ago, since I'm only there a couple of times a year it felt like I was the CAMRA quality inspector). Last time it was the dregs of a cask - I got the first pint of the next and it was outstanding. This time I changed to another beer - the munich - and that was in mighty fine form.
I'm not so sure you need a handpump but there's no better feeling than pulling a pint of your own beer on your own pump in your own home...
Tell you the Honest truth No Bitter tastes the same out of a keg and C02, and I think we are kidding ourselves if you think you can brew a Bitter and have it taste the same as a english brewed bitter.
I brewed up a simple one for my recent b/day. 11.5 liter batch and transferred it to a 12.5 liter 'chilly bin' thing shaped like a keg (with one of those small push button spigots) that I got from the Warehouse. Conditioned it with just a wee bit of DME for 7 days in the coldest room in the house. The carbonation was spot on, the overall flavour was nice. However, I'm sure I could detect a wee bit of plastic in the taste. All of my English mates at the part loved it. However, they were pretty well gone by the time I opened it up.
Here's the only photo I have of it. The first pint was rather cloudy (as you can almost see in the photo) but it was really clear after that.
I noticed at the Homebrew Comp party at Bar Edward last year a few of you guys had beer pumps. Where did you fellas get them from? I'd love to add one to my toy box.