There are certain limitations because this service appears to be intended more for what eBay call “professional” sellers.. For instance all potential eBay Express sellers have to meet the following criteria:
1. The seller must be based in the UK and the seller's items must be located in the UK
2. The seller must register (or already be registered) as a business on the eBay.co.uk website
3. The seller must register (or already be registered) with PayPal as the holder of a Verified Business or Premier Account
4. The seller must complete (or have already completed) PayPal's "Recommended Steps for Merchants" to provide PayPal with the their business details.
Once a sale is made payment is made before the seller is informed of the sale and once they have been notified sellers can dispatch the item knowing the payment has already been received.
The rules placed on the sellers include:
1. Sellers may only list and sell new and unused items on eBay Express.
2. Sellers may only sell items at a fixed price on eBay Express
3. Sellers may only list items that are located within the UK.
4. Sellers must list items in the appropriate category*
5. Sellers must provide an accurate and complete description of each item and provide at least one clear photograph of the listed item.
6. Sellers must specify the P&P costs for delivering items to buyers in their listings and such P&P costs must be reasonable.
The categories that currently are permitted for eBay Express are:
Audio, TV & Electronics , Baby & Nursery, Home & GardenBooks, Cameras & Photo, Clothes & Shoes, Computing, Health & Beauty, Jewellery & Watches,Mobile Phones,Music & DVDs, Sports & Leisure, Toys & Games
Video Games,

Currently eBay Express is not available for eBay.ei.
For more details of eBay Express visit: http://www.express.ebay.co.uk/