Really surprised by how negative everyone's comments are about this dive site.
I dived it yesterday, 3rd May 09 and thought it was a lovely little dive,
ideal as a second dive.  
If you are looking for a large intact wreck this site is not for you, I would
describe it as a scenic dive with pieces of wreckage.  Having said that the
bits of wreckage are teaming with life, beautifully coloured wrass, dog fish
and bib.  I saw an edible crab living in one of the boiler tubes that must at
least 25CM across.  The vis was good, the site is easy to find, just a
stones throw south of shag rock and the boiler shows up pretty clearly on the
sounder.  7 Club members dived it (all for the first time) and we all loved
it.  
Judging by the very mixed reaction this site gets, I think it might be one of
those dive sites which is better dived at certain times of the year.
Certainly the site next to it, "Mewstone Ledges" is a great dive in late
spring / early summer but gets ruined by excessive kelp growth later in the
year.  We also had the advantage of diving on neap tides and with good
weather so maybe that makes a difference.

Ed