Ok, that's a top coil and as they call it "CE5 like" clearo. To do a 180 - literally - you may want to try a bottom coil (BCC) design instead. Since the coil and wick are at the bottom it eliminates all the issues of a top coil. With a BCC if there is liquid in there the coil and wick stay wet.
Any of the Kanger BCC's would be a good choice. They all largely function the same so you are looking at differences in materials, style and cost. The least expensive are the Kanger T3s (plastic), MT3s & EVOD (metal enclosing plastic). The more expense are any version of the ProTank, which eliminates the plastic and has a glass tank instead - PT1, PT2 or the mini version of either. The all use replaceable coil/head assemblies.
You can see the entire Kanger line at Sun-Vapers.com before you start sourcing them through UK suppliers if you want to take a look.
BUT: Regarding the GT batteries. Sigh... they aren't making this easy. Your site says they are eGo... but only have a 510 connector. Also says they only work with "GT atomizers." What I'm getting at is I can't tell if they have eGo threading on those batteries or not. (The site images weren't clear enough to tell.) Wait...
This site clearly shows the battery and they
do not have eGo threading:
EGO GT VARIABLE VOLTAGE BATTERY
In other words, they sold you a rather kludgy battery.
The only two things that will fit on it would be the ProTank1 or ProTank2 as those use the 510 connector only. All the others - EVOD, T3s, MT3s and mini PT's - all use the eGo threading to screw on - which is absent from your battery. You can get a 510 to eGo adapter to use them - but it's not going to look all that great with the extension that adapter wil be adding on. Won't exactly be a seamless look to it.
You have to watch what you are buying with those batteries. Any devices that say they are eGo threaded won't screw onto them without the use of a 510 to eGo adapter.
I probably just planted more questions than I answered, but fitting stuff to those batteries is going to be a problem and most stuff will need an adapter.