Legally they have a "duty of care", for your TV whilst in their possession, and you already have proof they failed this obligation.
As Curry's have admitted liability through offering vouchers, then they are obliged to either offer to replace your set, like for like. (or)
If that's not possible for some reason like it's discontinued and they no longer stock it, then vouchers, or cash equivalent to the price you paid for the set should be offered, in order to enable you to replace it with another set of the equivalent specification and value.
As for the 6 weeks wait ask them why so long ? If they can't send them faster ask for a loan set in between, I think you may find you get reimbursed a lot quicker !