24-48 hours is pretty much the norm now for UK deliveries.
Earl
Finally you hit the nail on the head
Absolutely this is what people expect. Its not so much a question of what to put in the t&c's, delivery times should be advertised on all product pages and the homepage - it's one of the things people care about most.
Reasons are as follow:
1) People are impatient and generally excited about recieving their new purchase
2) Without doubt peoples biggest frustration with shopping online is missing the delivery attempt by the courier/postie. If you can't give a specific day (i.e. next day) they don't know when to be in.
3) People shop online a lot these days, they know what to look for when choosing who to buy from. Long or non specific delivery times are a good indication the retailer doesn't have the item in stock - and that they may not be trading properly in a number of other ways.
I also notice you refer to drop shipping, when in fact the business you describe is certainly retail. The entire point of drop-shipping is that you avoid seeing the item altogether. You are surely just setting up an online shop with no stock, and ordering goods in only to meet orders. This isn't exactly the correct way to trade as a rule. I reccomend you read the distance selling regs if you want to go heavily in to ecommerce.
When we started out selling online we did what you tried to do. We had a good degree of success because we were extremely low price, but that was nearly 3 years ago now. People were less clued up then. Now online shopping is so common, the general public know what to look for. We also realised pretty early on that getting a stock built up, advertising items as 'in stock' and promising next day delivery were going to make us go from 'bedroom seller' to warehouse, staff, offices and most importantly, we would build a very strong reputation.
I would urge to you to calculate how much it would cost to have at least one of each item in stock, across at least half of your intended product catalogue. Then work out how to fund that. Stock is a very low risk thing to invest in, because it retains its value, its designed to be resold. If the business doesnt work you can always sell it all off at 10% below cost to shift it very quickly. Banks are more likely to lend to buy stock than most things, although they will typically need buy-back rate assurance from the suppliers and possibly other securities (such as the stock value can only be realised in the banks favour should you go bust).