Sorry I'm very late getting back to this post, I had a sick child, then another sick child - eugh chicken pox!
Anyway, I've loved reading your replies, so just to clear a few things up -
I've been given £6,000 by grandparents who want me to upgrade my kit and pursue photography again, the money is solely for that purpose they're very strict about that! ;-) So it's not money I want to waste because It's not money I'd be able to save up again too quickly and is an awesome opportunity not to be missed - I want to get it right!
I am not very technically minded as I've said before, but I like to think I'm pretty good with a camera regardless, I don't necessarily think you need to always know WHY things work, as long as you know that they do! I used to do it semi professional (I guess you'd call it?!) I used to do band photography - like album cover stuff not gig photography - to get some extra pennies whilst being a student and I regularly take pics of my kids and family so I'm not starting from the very basics, but I've not really upgraded my kit for a while and I know things have changed a lot since then!
I see your points about buying cheaper/
second hand but I don't want to buy a cheaper or
second hand kit because of the reasons above - I will eventually upgrade again anyway and I have this money now, and only now so want the best I can afford! I know I'll have to learn a lot but I'm not as stupid/ditsy as I probably come across ;-)
Eloise - You've made a good point, I'm such an online girl, I hate going into the city so yea it's just online reviews I've been going on - I will have to suck it up and go to the city and try in some shops!
Thanks for the sigma suggestions, I've only been looking at Canons as that's all I've ever used so this gives me more choice and will do some investigating
Great to know my choice has a slow focus, that probably makes it useless for me, kids move too quick! I have a very slow focusing tele lens and it does my head in!
Thanks everyone for the awesome suggestions, I will look into them all and I super appreciate you all taking the time to advise me
Sorry again for my lateness!