How to improve Orange Livebox wifi performace

Good morning All,
Currently sitting in my parents house in Chichester and getting 40 meg plus download speed. Je rêve!
Back to France later today, returning to on-going Orange router probs. These have been recurring over the two and a half years that we have lived there. In fact we have an engineer arriving Wednesday morning, the fourth in six weeks or so, although he is billed as “level two” by those nice people at the English helpline. We shall see.
We have been getting conflicting advice. Often the line test reveals an external problem, but last time we were told that we had to replace our internal wiring which was apparently the issue. Did so at some expense but the same old problems, periodic dropping out, often for hours on end, recurred after a day or so.
Interestingly, the live box pictured at the start of this blog is, I am told, the third generation model. We were supplied one of these originally and it did not work that well. It was replaced like for like and we still had problems. Consequently, Orange sent us a second generation, white box which worked well for a time. The engineer told us that the white box is better for people who live a distance from the local exchange. This has now been upgraded to a digital signal, so no more ADSL adaptors required. On a recent on site line test we were told that we could get around 8 meg, compared to our meagre 2 meg that we actually get (sometimes). This was later refuted by another “expert engineer”. We too have wifi issues, particularly with the iPhone. The iPad seems much better at receding a signal which seems to indicate that this problem can also be related to the type of device one is trying to connect and possibly the software version installed. I will be trying the channel switch work around, once I can re-find it on the Orange user settings site.

Anyway, our current box, a replacement from about six months ago, now seems to be struggling, so new one being installed, after much pleading with the techies. Fingers crossed! I will let you know what the outcome is.

However, any advice very much welcomed!