Castle Bromwich appears to be about 3 nm from touchdown on the runway in question and at that point aircraft should be around 950 ft . If one was just above 150 ft it would be a very serious incident which would surely make the press and TV, etc.
It's exceedingly difficult for the untrained eye to accurately estimate heights of aircraft, as I know from plenty of experience during my time at Heathrow. The Noise Nutters from Windsor once insisted to me that aircraft fly down Windsor High Street at 500 ft and no amount of my explaining would convince them otherwise.
I thought a 777 overflew us well below the usual altitude a few days ago but when I checked it on SBS it was around 5000ft and well within normal limits.
Lastly, ATC radars have height readout and a deviation of that degree from the normal glideslope would be seen.