i raced from stratford brought back from windrush got 5 out of 10 so not to good and i was around 20 mins behind the winner but theres always next week
take the bird out of your loft straight away and desinfect all perches floors drinkers every thing and keep an eye on your other birds for the next week check there dropings make sure they are not watery and give them some probiotics in the water
i would not think that would matter mate if they are completely at ease with you being there then it should be fine a local fancier round here spends hours with his team and he does very well in racing in the cards every week