Hi om,
The following FAQ may help further :
ESA Medical – What to expect I always advise that you should treat the assessment as starting and ending on leaving home and on your return.
How you managed the return trip will be taken into account, you may also be observed approaching the assessment centre, whilst inside, and on leaving.
Assumptions may be made from such observations.
You can check out the assessment centre in question :
Here. Good luck, and please keep us updated.
bro58