[malaguti]

I know I won't be the first having looked at this, so I'm hoping someone has already found the answer: I want to be able to trade the index rather than a stock within the index.
How can I do this, within an ISA/SIPP?
Is there such a thing as an ETF of just one sector? or a unit trust for example
And where can I trade this, do I need a broker that allows this?
Given that the index is an average of its individual components, it seems to perform far better than even an individual stock using the weinstein method.

An example is:
Fixed Line telecom sector within UK.
Best chart is BT, worst chart is COLT
We'll never know which stock is going to perform the best, so we may have been unlucky in getting into COLT, rather that BT yet the index itself conveniently aggregates all the movements into incredibly smooth trending charts.

Ultimately I'd like to combine my portfolio of individual stocks, AND the index itself.

Hopefully this isn't too confusing