The tank looks lovely.
But you do have a problem with your stocking I'm afraid. I'll run through your fish list so you can see what I mean.
Platies - fine if you have hard water. With 3, you should have all males or all females or 1 male 2 females.
Zebra danio - these are shoaling fish so you need at least 6 of them
Neon tetras - fine if you have soft water
Male betta - bettas are not community fish and should be kept alone in something like a 25 litre tank
Albino cory - shoaling fish which needs to be in a group of at least 6.
Yellow plec - if it is a bristlenose, fine. If not it will get too big for your tank
Cherry shrimps - fine
Yoyo loach - shoaling fish that needs to be in a group of at leats 6 in a bigger tank at least 120 cm long
Rainbow shark - needs a tank at least 120 cm long, and has a reputation for being nasty.
The real problems are
The fish you didn't plan on - both of them
The shoaling fish that you only have 1 of - cory and danio
The betta, which shouldn't be kept in a community tank.
But if you have soft water, neons, danios, cories and the plec are fine.
If you have hard water, the platies, maybe the danios and plec depending on just how hard
I'm sorry to have to say all this
A little job for you. Look on your water company's website for hardness. If you can find it, look for a number rather than some words - and the unit of measurement as UK water companies often use different units from fish keeping so we need to convert it. (If you can't find it, tell us the name of the water company and we'll see what we can find)
Once we know how hard your water is, we'll be able to talk about what's the best for your fish.
One last thing. Something we have all learned that hard way is not to trust anything a shop worker tells you. So many of them haven't a clue or don't care and will make up anything to get a sale. You have mentioned Pets@Home, and they have just about the worst reputation for rubbish advice.