Employee share save - capital gains tax

Hi

I have a 5 year employee sharesave due to mature in August this year which I will cash in straight away as I will use the money towards a deposit on a house.

Is it possible to avoid CGT by getting my initial investment, 11000 tax free and then put the rest into an ISA and then withdrawing it from the ISA when I need it. And would I need to let the HMRC aware of what I have done with the money?

Thanks a lot

Adam