Sorted
I went back to the RideLondon website and found out that as well as using TCX you can use FIT and GPX files as well.
Downloaded again using FIT to new files transferred to the Edge and that's that.Didn't need Garmin Connect.
TCX file was 1.2 mb and the FIT was 73kb, some difference.
Thanks everybody for your useful comments and i hope i didn't waste your time.
