Gents,
Thank you for the helpful responses.
With a few other flights, I realise it is entirely my fault (DOH!!)..I forgot to leave the aircraft to do its own thing in the climb, but started messing with the speed too soon
I see from tutorials that you set V2 speed on MCP and leave it alone until after SID limitations etc, then altitude shud be increased by "intervene"
Thank you for your comments..wish I was a little less dumb now rgds
John