"Dave Plowman (News)" wrote
| Without reference to Building Control you are allowed to *repair* an
| existing window. ...
| Would this include changing an entire UPVC DG window for another?

No, that would be replacement.

| After all presumably the regs are there to make sure adequate
| ventilation etc if changing old windows?

Yes, but under the regs *replacement* windows must be fitted by
FENSA-registered contractor or DIYed under a building control application.

Owain