Jonathan wrote:

So, the tv isn't THAT heavy, but the concrete is just not giving! I
drilled a smaller pilot hole (took 5 minutes to go 1" with a 5mm bit)
but when it came to the 8mm bit, really nothing was happening. I gave
up after about 15 minutes and 3mm having gone slightly deaf!

You can hire an SDS drill from a tool hire shop which should do the job.
Just checking - your drill wasn't in reverse was it?


--
Dave
The Medway Handyman
www.medwayhandyman.co.uk
01634 717930
07850 597257