The Echoes webpage for each sash may be viewed by visiting https://explore.echoes.xyz/ and typing ‘sash’ in the Find your next adventure box. No need to press Enter, in fact it does nothing. Clicking the magnifying glass instead finds local walks, which may or may not be sash trails.

Unfortunately only the first 10 show up so here is the full known list:

South
The Buckingham Arms, Shoreham-by-Sea, BN43 5ZH (by Dangleberry)
The Plough Pyecombe, BN45 7FN (by Dangleberry)
The White Hart, Henfield, BN5 9HP (by Dangleberry)
The Stand Up Inn, Lindfield, RH16 2HN (by Dangleberry)
The Fox, Old Coulsdon, CR3 5QS (by Dangleberry)
The Fountain Inn, Plumpton Green, BN7 3BX (by Dangleberry)
The Downs Hotel, Woodingdean, BN2 6BB (by Dangleberry)
The Bear, Horsham, RH12 1EU (by Dangleberry)
Former Port Hall Tavern, Brighton, BN1 5PL (by Dangleberry)
Hove Park Tavern, Hove, BN3 7AP (by Dangleberry)
Hollingbury Park Bowls Club, Brighton, BN1 6JL (by Bosom Boy & Drambulie; also in a slightly different format)
The White Hart Inn, Catsfield, TN33 9DJ (by Dangleberry)
The Ringles Cross, Uckfield, TN22 1GH (by Dangleberry)
The Plough Inn, Ifield, RH11 0NN (by Dangleberry)

North of London
The Swan, Grendon Underwood, HP18 0SW (by Dangleberry)
The Black Horse, Kidlington, OX5 2BT (by Dangleberry)
The Station, Sutton Coldfield, B73 6AT (by Dangleberry)

Or search the map below