In reply to Gary Latter:
Grade amendments, in comparison to your guide, as promised:
(NB only amended grade shown, maybe some overlap with comments above. Some star amendments.)
P27: Hairy Beast E1 5c ** - awkward thuggy crux.
P27: Veritas Splendour E2 5c, 5b *** - lower crux shortlived and safe, upper arete easy.
P62: Hand Jive E1 5b ** - no vicious crux, steady HVS+ jamming.
P67: Whispering Crack E3 5a,5c *** - first pitch is definitely 5a.
P70: Wish You Were Here E2 5c *** - others have suggested 5c and this is probably right, quite tricky crux.
P71: Gammy's Purse direct start E2 5c ** - hard steep moves on thin jams.
P74: The Man From Ankle E3 6a *** - very thin moves on the crux groove.
P119: Animal Magic E3 5b * - very bold with big runouts.
P122: Bogie E2 5b ** - maybe ***, great climbing all the way.
P123: Rough Justice E2 5c ** - maybe ***, great climbing all the way.
P125: Aquamarine E4 6a *** - top end 6a for normal sized folk, hard and thuggy.
P137: Bold As Brass Direct E2 5c *** - top end of this grade but no harder, excellent route.
P138: No Beef E2 5c * - good small wires at crux, then one step left to bomber wires at finish.
P147: Macdonald E4 6a ** - steady but very good route up a nice logical feature.
P148: Peweky E1 5b * - just one hard move and reasonably protected
P151: E2 5b route is E2 6a * - 6a boulder problem then boldish 5c into crack.
P151: In The Pink HVS 5b *** - classic all the way.
P151: Rouged Up E2 5b * - decent small wires at good rest before crux.
P151: Sprocket Direct E1 5b ** - very steady, bold bit is easy, safe on mild crux.
P152: Heave Ho E4 6a ** - two good cruxes with decent gear and decent rest, a fine route.
P152: Peek Practice E4 6a * - bold thin cranking with only tiny wires in flake.
P153: Lifeline E3? 5c? - could be harder.
P154: White Fright E2 5c * - bold at this grade but tricky bit is steady and low down.
P154: Rock Bottom E3 6a * - crux pull is desperate, reachy, and involves a blind hold.
P155: Malpasso E2 5b ** - bold but safe enough, spaced cams are good. E1 if you have 5 or more small grey camalots!
P181: Hate Mail E2 6a ** - as per SMC guide, hard 5c to gain flake, committing 6a move past it.
P182: Raglan Road E1 5b ** - steady, good wires.
P185: How The West Was Won E4 6a *** - probably worth it's original SMC grade, though soft. Great route.
P191: Call Of The Wild alt start E4 6a *** - because crux is upper groove after good rest.
P195: Hydrotherapy 7a *** - harder than many 7as in Scotland (confirmed by 8b+ partner!)
P202: Gaffer's Wall E2 5c ** - two E2 bits but perfect rest inbetween.
P215: Sculptress HVS 5a *** - best short HVS in Scotland?? Delightful.
P216: Unleash The Beast E3 6a *** - top end E3 6a but too safe and too good jams.
P220: Exasperated Escapologist Direct E4 5c *** - soft E4, solid 5c, steady climbing on bold bit and good rest before safe steep bit, great line and great climbing.
P231: Sonique E4 5c ** - maybe worth it's original grade for sustainedness.
P232: Headstrong E3 5c ** - maybe worth it's original grade for short-lived crux with okay gear.
P237: Rampant Groove E3 5c ** - maybe worth this as gear is fine just fiddly, and can go up and down placing it.
P249: Moronic Inferno E3 5c ** - maybe just worth this as it's steeper and pumpier than the routes further left.
P249: Split Personality E4 5c ** - pumpy, committing, so-so fiddly gear during crux, more than a grade harder than routes further left.
P249: Crann Tara and Right Of Spring both E2 5c *** - good gear with good shakeouts and the best climbing on the wall.
P258: Braveheart E2 5c ** - soft at this grade but a bit too cranky for 5b.
P258: Freedom! E3 5c ** - reasonably protected from good rest with steady cranking on good holds over roof.
P259: Cyclops E2 5b ** - steep but steady.
P264: Inertia E3 5c ** - as hard as any E3 on here.
P265: Failte Gu E3 5c *** - as easy as any E3 on here.
P277: The Sky's The Limit E2 5b ** - short-lived and reasonably safe.
P277: Little Star E2 5c *** - thin moves but safe all the way.
P277: Solar Gain E2 5c ** - steady with decent gear.
P277: Moondust E3 5c ** - bold and committing with spaced gear.
P278: Black Gold E2 5c *** - very steady, safe, and delightful.
P279: Goat Of Barten E2 6a * - bouldery start and a bit awkward one move wonder.
P279: Rhicorner E2 5b *** - nice steady climbing, good line, route of the crag.
P282: The Swirl E4 6a *** - solid E3 5c to the ledge and desperate above it.
P290: Above The Blue E2 5c ** - steep and bouldery.
P290: GLOP E3 5c ** - steep and bouldery and committing and sustained and blind to finish.
P292: Bloodlust Direct E2 5b ** - only just worth **, worst E2 on the main face, fiddly pro and awkward placing it.
P293: The Black Edge god knows.
P319: Occam's Razor E3 6a *** - shortlived and steady, very good.
P320: A Paddler's Tale E4 6a *** - as suggested by others too, continuous, cranky, hard fingerslot swap at crux.
P320: Walking On Water E3 5c *** - maybe worth this for upper crux.
P321: Northern Alliance E2 5c *** - maybe this is okay as it's fairly steady.
P460: South Face E2 5c * - 5c pulling over thuggy green crux crack in middle of P4.
P467: Bleed It Dry E4 6a ** - blind committing moves with low cam protection and ramp to hit.
P470: Thing Of Dreams E4 6a *** - hard 6a crux on poor sloping holds amidst sustained climbing with minimal gear. Desperate.
P470: Dark Island E3 6a *** - steady crux is well protected, arete above has spaced but decent gear and easy climbing, beautiful elegant route.