Venus is on a totally different orbit to Earth. Approximately 72% of the distance from the sun of earth's orbit. Venus's year lasts 224.7 earth days. in other words, it takes Venus 224.7 days to complete an orbit of the Sun, but it takes Earth approximately 365 days.
so it orbits approximately 1.62 times faster than earth
If the above is correct, then how can this be Venus if it appears in the sky at the same place at the same time every evening?
How long have you observed it for, and how accurately?
You'd probably find that it appears in a similar place rather than the same.
I have to wonder what else it could possibly be though - there's nothing even close to Venus' magnitude in that part of the sky.
Here's an experiment for you to do this evening...
Assuming I've got the right location for you (I put Addington, Surrey into Google Earth and got a rough Lat&Long for you)
At around 1730hrs look to the SW sky (around 240° from North), Venus will start to appear around 35° up from the horizon.
By 1750hrs to 1800hrs it should be at its full brightness 30° above the horizon in the WSW sky (245° from North).
If you can identify them (look up how online if you want to check this point) It will be just up and to the left of the lower point of the rough triangle made by the constellations Pisces and Andromeda.
It will set around 2045hrs at 280° from North.
Assuming you don't have a compass with you, an easy reference is the point the sun sets, it will go down roughly at 250° from North too - so if you remember that point the rest of the action should be in that part of the sky.
Now, if the thing you've seen does those things or anything even vaguely close it it, it is Venus. There's nothing else even remotely close to it in the sky with a similar brightness.
Have fun!