So, here you say the wired is coming in at 48 and another link shows it to be 50 - broadly similar.
You have an up to 55 Mbps which means that you would only get 52 Mbps throughput.
So, with a potential 52, and seeing 50, you are very close and at 5:30 in an evening when most school kids are home and overloading everything some minor congestion may occur. I would not be unhappy with 50, or even 48 in these circumstances.
Your low figures of 35 are almost certainly WiFi related and not the VDSL connection.
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