Unfortunately this year the 350 litre magnum water butt has not been available due to a manufacturing issue. Normally a good % of customers would opt for this size. As a result the 200 litre double kit is the size everyone has been ordering instead, which has made the reserves of them deplete much faster over the summer, as these sales have added to the usual ones for this size (the 200 litre double kit is always the bestseller overall). This has speeded up dramatically with the declaration of drought last week. A big surge of orders occurred, and it is likely delivery slots will now take 4 to 6 weeks from the date of order. Smaller sizes should be able to be sent out faster, ie. 7 to 14 days. So that is the 114 litres, 100 slimline, and 100 slimline double kit (200 litres) and the 168 litres kit.
The same wait will apply to the larger sized kits that use the 200 litre barrel, so the 600 litre and 800 litre kit will also take 4 to 6 weeks.
Hopefully this will remain the case, but they might have to go off sale for a while, if demand remains too high to deal with, within that timeframe.