What does the product 'availability' mean?

Generally speaking, items listed as 1 working day dispatch are those we hold in stock in at our London store (although this isn't always true), where orders are processed and dispatched from. Other dispatch times are based on how long it takes to receive the item from our supplier's warehouse. Please note, these times are for guidance and may be longer than expected during busy periods. We will notify you if the dispatch time is likely to vary from the one advertised.