Leading Suppliers Nationally for Abrasive Products, Aero Engine Turbines, Cast

Here is a list of leading companies in the United Kingdom for each of the industries you specified:

Abrasive Products:

1. Saint-Gobain Abrasives
2. 3M United Kingdom PLC
3. Tyrolit Group
4. Bibielle UK Ltd
5. sia Abrasives Industries AG

Aero Engine Turbines:

1. Rolls-Royce plc
2. GE Aviation
3. Safran Aircraft Engines
4. Pratt & Whitney
5. CFM International (a joint venture between GE Aviation and Safran Aircraft Engines)

Cast Products:

1. Cast Metals Federation
2. Sigma Electric Manufacturing Corporation
3. NovaCast
4. Harrison Castings Ltd
5. Thomas Dudley Ltd

Please note that this list is not exhaustive, and there may be other notable companies in each sector as well.