In reply to brianjcooper:
> As the first pitches of Grim Wall and Meshach both start quite close, although not directly under the pinnacle of Shadrach, should they too be considered in any danger from the trajectory of the loose block or indeed, the pinnacle.
> They are, were, on my tick list for next month.
By far the most likely cause of the blocks falling would be the weight of climbers pulling or standing on them, if nobody is climbing them then the chances of them spontaneoulsy falling would be much smaller.
It would almost certainly need some other external factor to tip the blocks into a sufficiently unstable state to fall on their own, freeze thaw or heavy rainfall, possibly thermal expansion but these are either unlikely at this time of year or you'd know about them (because it would be freezing or p*ssing down!).
That said, I haven't seen the blocks recently so you'd have to make your own judgement on site, don't blame me if they fall on you!
You could aalways climb the first pitch of Grim Wall Direct, soft touch and a great first E1