UPDATE 1-Clapham says H1 revenue up 2 pct

* Sees UK trading conditions remaining tough * Says discounting hitting net margins of sector

* Cautious in terms of future restaurant openings (Adds details)

Sept 29 (Reuters) - British restaurant group Clapham House Group Plc (CPH.L) said on Tuesday first half to end-March revenue grew 2 percent from a year ago, but expected trading environment in the UK to remain tough, especially in its Tootsies business.

The owner and operator of Gourmet Burger Kitchen (GBK), The Real Greek (TRG) and Tootsies restaurants said the restaurant sector continued to see widespread discounting and promotional activity hitting net margins.

The company, which opened its fiftieth GBK restaurant in the UK, said it continued to be cautious in terms of future openings amid the current economic outlook, but was looking to identify "strong locations on attractive terms".

Clapham shares closed at 69 pence on Monday on the London Stock Exchange. (Reporting by Tresa Sherin Morera in Bangalore; Editing by Deepak Kannan)