Echo the recommendation for the Subway over the Apollo.
But whatever you buy, make sure it's properly set up (and I'm afraid you can't rely on
Halfords to do this really). See if there is a forum member near you who'd be prepared to give it a look over for the price of a pint or something. If you're new to it, you might get put off by something which can be easily remedied, but you might not know is wrong (bad gearchanging, slack brakes, badly adjusted saddle/bar heights etc.
Easier, and more puncture resistant, tyres are a worthwhile investment, though even the most careful do get punctures, and you just have to man up and deal with them
Be prepared to buy a different saddle. Everyone is different in this department, and it's very hard to tell what's going to suit you. Don't buy the most padded one in the shop, as that's likely to be, oddly, the most uncomfortable when you come to riding.
Errr, what other advice while I'm pontificating? Oh yeah - don't forget to get a decent set of tools (you don't need much) including a puncture repair kit (don't believe anything anyone tells you about Slime. It isn't worth the hassle. And take a bottle of water everywhere you go.
And keep your tyres pumped up.
Have you thought about how you'll be carrying your luggage? There's a whole extra discussion to be had on that...