Replacing basin tap but flexible pipe to replace

[Ben-gee]

What you have drawn in the picture is tightening it up! No wonder you've been struggling!
Hold 3 and turn 2 the opposite way to your drawing.

 

[Ric2013]

Flexi pipes like these are, really, a bit of a 'bodge' and have no genuine longevity.

My feeling exactly.

However, I have seen bathrooms in Italy: steel tubing inside wall, with a short flexi from the wall to the tap. And no one carries out routine replacements. They do seem to last okay. I suspect the difference is that both ends of the flexi are properly supported, whereas the OP's system seems to use a flexi to hang a pipe from the tap, which must inevitably lead to increased strain.

OP: If you must use flexis, go to BES (online) and get one of their WRAS approved ones. Reasonable quality for a reasonable price. If you will buy cheap, unapproved products from the likes of Amazon, please bear in mind they are illegal to install anyway (although prosecution is probably reasonably unlikely, for the sake of the quality of the drinking water in the public network (and in your home), don't put drinking water into contact with unapproved materials). EDIT - I'm not talking about the taps, which, being Bristan, will be fine.

 

[Luca]

What you have drawn in the picture is tightening it up! No wonder you've been struggling!
Hold 3 and turn 2 the opposite way to your drawing.

Sorry but I'm really a beginner

 

[Ric2013]

Sorry but I'm really a beginner

That's what forums are for sometimes!

 

[Luca]

A big thanks to everyone for your precious support!!

 

[Harvest Fields]

No worries mate.

 

[Welder]

My feeling exactly.

However, I have seen bathrooms in Italy: steel tubing inside wall, with a short flexi from the wall to the tap. And no one carries out routine replacements. They do seem to last okay. I suspect the difference is that both ends of the flexi are properly supported, whereas the OP's system seems to use a flexi to hang a pipe from the tap, which must inevitably lead to increased strain.

OP: If you must use flexis, go to BES (online) and get one of their WRAS approved ones. Reasonable quality for a reasonable price. If you will buy cheap, unapproved products from the likes of Amazon, please bear in mind they are illegal to install anyway (although prosecution is probably reasonably unlikely, for the sake of the quality of the drinking water in the public network (and in your home), don't put drinking water into contact with unapproved materials). EDIT - I'm not talking about the taps, which, being Bristan, will be fine.

Unfortunately Ric, WRAS approval does NOT indicate 'fitness for purpose' or any form of 'quality' as we, or a user, would mean.
WRAS approval is simply testing that the NON METALLIC elements used in its construction do not contaminate the supply.
Genuinely, 90+% of the time it's the same sh1te inner hose used as the cheaper ones but they just don't pay stupid sums for 4 letters to mean NOTHING. They still break down after a few years!

If you want quality & reliability then have to have the hoses made.