Will Bosi has made the second ascent of Aidan Roberts' boulder, Isles of Wonder SDS (f8C+), at Carreg Mianog Boulders, North Wales. Initially graded at 8C+, Will has suggested a downgrade to 8C.

The boulder, and its intense shouldery sequence, was one of the featured climbs in Mastery, a documentary about first ascensionist Aidan Roberts and his recent bouldering endeavours.

Aidan broke the boulder down as 'Hard 8C to the stand, then 8B to the top', the second half being Pete Robins' pre-existing 8B boulder Isles of Wonder (f8B). Aidan further shared that the sit down start was 'maybe the best boulder [he had] ever developed'.

Having first come across the boulder in 2021, Aidan tried a number of different methods to get through the lower section, before ultimately deciding that he was, in his own words, 'too weak'. He returned in the summer of 2022 'with a year's training under [his] belt', and made quick work of the lower section, but still struggled to link the whole line together.  Eventually it all came together, and Isles of Wonder SDS became, at the time, the second 8C+ graded boulder in the UK.

Just over two weeks later, Will climbed Honey Badger (f8C+), the UK's third 8C+ boulder, Will's first FA at the grade, and his first 8C+ boulder altogether. In the five months that followed, Will made rapid ascents of top-end boulders Jimmy Webb's Ephyra (f8C+) in 'only a couple of days', as well as Shawn Raboutou's 9A boulder Alphane, after just thirteen days of effort.

Fast forward a few months and Will had captured the attention of the climbing world with similarly rapid progress on the world's first 9A boulder, Nalle Hukkataival's Burden of Dreams (f9A). After twenty-four days working the boulder, Will made the long-awaited second ascent of Burden of Dreams, seven years after the first ascent.

Having only been back in the UK for a month, Will has made quick work establishing new hard boulders and taking on established ones. In addition to Isles of Wonder SDS, Will recently established a new 8C boulder, Wild South, at Raven Tor in the Peak District.

Sharing news of his ascent of Isles of Wonder SDS on social media, Will said:

'Isles of Wonder Sit 8C. Super happy to send this incredible line and spend time in this amazing place again! Grade wise I found new beta that felt a fair bit easier to me so I think it's hard 8C, time will tell though'.

'And yes I did get sunburned at the beach before hand!'

Check out Will's video of the ascent below: