There also genetic factors along with your age you have to consider as well....I mean just because a guy is over the age of 25 doesn't give a 100% guarantee that his test levels will bounce back to normal no matter how aggressive the PCT was. He could just be one of the few that doesn't fully recover. Its simply chance, for example some people can smoke all their life, live till their 80 and end up dying in a car crash. Then there are other people who smoked for five years of their life and ended up dying of lung cancer at 40. Everybody's body is different and we all respond to things differently.
With regards to steroids if your under the age of 25 you have an even greater chance of not fully recovering. Your body has so much sh!t going on right now the last thing it wants to do is trying to pump your test levels back up. If there is already a risked involved why add more? So you can get marginally bigger for a few months? Then loose it all, have limp dick, acne scars, depression, and ton of other problems associated with low test. O and on top of that you will be at least $500 poorer from wasting your money on the gear. Do you know how many chicken breasts and egg whites $500 can buy? If you were to eat all that food you would probably make and sustain better gains then you would get from taking the gear.
FYI: Just because you said you were educated and are at a top UK university doesn't change your thread from the rest of the guys. Whom think since they have read a little about steroids and have been 'lifting weights' not seriously bodybuilding for a few years that it makes it OK for them to do steroids when there 19.
Sorry if I came across as a bit of an ass at the end. But its true.
-D