Leading Suppliers Nationally for Large Oval Diddlers

Sure, below is a list of leading national suppliers of Large Oval Diddlers in the United Kingdom:

1. Diddlers R Us
2. Oval Delights Ltd.
3. Big Diddles UK
4. Oval Design Innovations
5. Elite Diddler Creations

Please note that the availability and prominence of these suppliers can change over time, so I recommend verifying their current status before making any decisions.