Thank you for the reply. Only the 3rd image had much of a crop out of them. The ISO was jumping way up and I wasnt happy with the results so I restricted it to 800 which then lowered the speed I could shoot at. I was getting around 1/200 and shooting up to 600mm, handheld in pretty dull conditions. I know I should use probably around 1/1000 of a second at 600mm on a crop sensor but the conditions just wouldnt allow for it without going to at least 3200 iso. The lens may need adjusting but Ill need to do a proper test for that.
Just checked on the blue tit picture and it was shot at 800iso, 1/100 of a second at 600mm