As a couple of people have mentioned the Auction for this collection is being handled by Hansons Auctioneers and Valuers
https://hansonsauctioneers.co.uk/auctions/
It will take place as an online auction between 27th May and the 3rd of June. You will need to register with the Auctioneers prior to the sale if you wish to bid.
The collation is just about complete and it is currently being organised into lots ( around 200) so I guess the catalogue will be available shortly.
Hope all that helps