Having recently acquired some lighter B2s, I no longer need these. EU size 44 (approx size 9.5 UK). Well cared for (tube of Nikwax waterproofing wax included), these are the 2009 Grivel Scarpa Binding version so there is a plastic insert in the toe which was intended for slotting the appropriate crampon fitting into. Don’t use this! It’s been superglued in and has never caused any issues.
Mantas are an ideal B2 boot for easier Scottish winter and Alpine stuff, arguably a bit too hefty for general hiking and a bit too heavy for good weather scrambling (they’re about 2kg for the pair). If you are based on London I am happy to bring to the Castle for trial fittings as feedback suggests they fit slightly smaller than some other versions of the Manta. Can provide pics on request.