The problem I find with dropshipping is that the products are available for anyone to dropship...meaning the price just gets lower and lower and the margin smalller.
Example...you see a nice item which will give u five pounds profit per item....any other seller can also see it and decide to take 4 quid profit a time...and so on
Furthermore...a lot of the aliexpress sellers have their own amazon/ebay stores, and you'll never beat their price
To be successful you need at least some/all of the things below
1. A unique product that no one else can source
2. You need to buy the product wholesale to get a good discount...that involves substantial outlay.
3. You need to be able to improve the offer with add-ons that dont cost you money (guarentee, warranty, support, etc)
4. You need better and more informative ad copy that the opposition