Getting in early for this one!
Monday is another Bank Holiday in the UK so the usual holiday dispatch rules apply - orders received up to 1pm Friday will be dispatched as normal and orders received after that will dispatch Tuesday.
In order to receive your orders by Saturday make sure to order early and select an appropriate shipping service. All domestic neck orders as standard ship by Royal Mail Tracked 24, which while not a guaranteed timed service is in my experience very reliable. I would say unless you absolutely require guaranteed next day delivery there isn’t a benefit to upgrading to Parcelforce 24.
Fingers crossed I should have at least one hardware shipment coming in next week and a Gotoh/Hosco shipment the week after!