You're maybe worth getting a pair of ego batteries and putting something else on them than the T atomisers. The ego C should be out very soon in the UK but by the looks of it only totally wicked are going to have it in for a while. It'll be a little more expensive from them but compared to the Ego-T the Ego-C has better reviews for flavour.
I prefer a CE2 aka fluxomiser on an ego for a tank type system. On the xl size you can hold 1.8ml of liquid at a time and it's much more flavourful and warm compared to the T atties. You can pick up a 5 pack of CE2s on totally wicked for less than a fiver right now. The 510 CE2s will work on your current 510 but the ego batteries will last a lot longer if you're considering an upgrade.
You can get a standard ego aka tornado from totally wicked for £30 just now too
Wicked-TORNADO E-NIC or Electronic Nicotine Imitation Cigarette Black just want to stick something else on it and it's 510 threaded, same as you have now.
Electronic Cigarettes - Items - FreedomVape (UK) you can pick up a set of 1100mAh batteries and an Ego-T from here with free shipping and 10ml of juice. 1100mAh batteries are pretty big so it's a lastability vs aesthetics issue.
So, in my advice, look around for other options than the Ego-T. It's on sale from a lot of vendors for a reason; it's not great. Wait up for the Ego-C to hit the UK or try out a CE2 or get the bigger ego batteries or just go for something else lol