Keep on going, Richard, until you bore the pants off everyone here.

I took all my fuses out, and the system had such an inky black background, it was awesome.
The trouble is, the music never started.

So far I've been too lazy to even try the gold plated copper bar I have that replaces the fuse. I just don't listen that critically any more.

I don't make any assumptions though, as I don't believe we can ever perceive sound "objectively". That's before we even start with different mains, cables and kit. I'd not be at all surprised if some people found the SR fuses to sound "better" than no fuse at all. I also wouldn't be at all surprised if others heard no diffence between standard fuse, no fuse and SR fuse. In their own respective worlds, they would both be right. 

I'd also only care what I heard and whether it made me feel better than sacrificing the amount of dosh I'd paid.

All interesting stuff. Regarding audiofool fuses I will always be a sceptic. Never the less, I do acknowledge that different fuses make a difference. A while back when I was using World Audio Design kit I built myself, once the amplifier had been proved to be absolutely safe, I and some others introduced an internal amp mains fuse of a higher value, such as moving from the recommended 1.6A fuse to something like a 3.6 or even a 5A option. I went 5A. What I and others found was that the higher rated fuses in the amplifier caused the sound performance to become more solid, authoratitive, filling out the sound stage better. Overall, the sound had more slam in the right sort of way. All the fuses used were bog standard slow blow versions readily available from RS, Farnell and Maplins. I have moved on from when I tried this, but my experience really does beg the question of whether no fuse and a bar or soldered link would sound even better. I have read that if your system is fed from an individual radial spur directly from your RCD consumer unit, none of your equipment down the line requires any mains plug fuses. They are apparently redundant. If that is true and if my findings are correct, surely fitting a soldered wire link or a copper bar across the plug fuse fittings is the way to go? Alternatively, use 15A round pin fuseless plugs and sockets. That’ll stop the Mrs plugging in the vacuum cleaner! Whoops, forgot, I do the vacuuming. Personally I’ve not tried any of this but I will be exploring the possibility further particularly as my system is fed with an over spec’d radial supply.

Currently I use a balanced mains supply. At certain times of the day the mains became audibly noisy and measurable. Yes, I measured it, Richard. I introduced a DC blocking circuit which sorted out the noise and it’s presence did not impact on sound quality.

It seems to me that the best option here is to start with education. Learn the facts. Then you know what to do. I have little doubt that Martin has experienced an improvement to sound after fitting these blue fuses. I question whether actually, considering his set up he could make even better gains by doing things a bit differently along the lines I have suggested. Finally, if you read the foo on the website for those audiofool fuses, how can any intelligent person conclude it is reality? Far to much pseudo science bullshit IMHO.

I had my own flat in the 90s so could do what I wanted to it. Whilst doing a complete re-wire I put a new consumer unit in and a radial circuit to my all Mission Hi-Fi and used 3 core twin and earth for all the mains cables. Cost me peanuts as I did it myself (used to be an electrician in the RN), the improvement was clear and I was rather pleased with myself. I didn't need to dig any Quantum Tunnels or spend the price of a family holiday on phoo.

Each to their own I guess, but to me music isn't a hobby and I don't like wasting money or paying money to people who are taking the piss or doing very little for it, no matter how much of it I have to fritter away. Not meant to be a slight on anyone, just my viewpoint.

I'll ignore Greg's audio opinion because he's likely deaf and using a shit system, based on Martin's treatment of Pinkie ;-)

However he has opened up an entirely new world of more efficient vacuuming for me, so thanks for that Greg...

This is getting interesting now.
I am going to pull up a comfy chair.

I understand, Greg, and there seems to be an awful lot of opinion out there suggesting that I replace my fuses with soldered links because I have a radial. However, that was NOT the opinion of my qualified electrician. He was careful in certifying his work but also checking out the safety of my setup, for which I was grateful. Should the worst happen I know that my system is as safe as can be and unlikely to cause the issue.

I think it would be more likely to be a regulations / insurance cover issue than safety.  If you have a separate radial with a breaker at 10A (or even 16A) then your system is safe as a French, Dutch, Swiss installation.  No fuses in my plugs - but all leads are protected by a dedicated 10A breaker.  (The other issue, VERY unlikely to affect your HiFi, is leads with smaller conductors intended for protection by 3A fuses)

But there might be an insurance issue in the event of a fire - based on regulations, hence your sparkies advice.  Note BS1363 is specifically a British standard, not EU regulations, and so for example, CE marking of plugs is not appropriate.