I still don't see the point unless you're actually operating a training outfit. Actually, as a big fan of "steam-gauges", I'd say a traditional 6-pack is better for training. (Won't look as impressive to the clientele though.)
Keep in mind (at least in North America, I assume it's the same back in the UK) you'll never get back what you put into it when you sell it again.
(I really like flying the 152. I like it more than the 172 or the PA28, but you can't carry anything in it, and doesn't get anywhere particularly quickly. The 152 is really not a great personal aircraft.)