Roger Tonkin wrote:
SWMBO was given a Tesco's Phalaenopis orchid in flower last August.
Flowers lasted till about January, but now I'm wondering what to do.

This tip of the main stem where is flowered has turned light brown and
looks as if it is dying. A branch stem about 3/4 way up also flowerd,
but still is blackish and looks healthy.

There is one small bud about one inch along the spur, and a good sized
bud on the main stem below where the branch comes out.

Should I prune back and if so to which bud, and how close down to the
bud. Thanks

The rule that I have always followed for orchids is:

* when it finishes flowering, cut back the stem as far back as possible
- will take longer to flower again, but will flower better than if

* ... cut back stem to just above a notch - will flower again sooner

If you still have buds, I would suggest cuttnig back the spent stem to the
nearest notch to where the branching occurs.