A group of around six people forced entry into Nationwide close to 11.30pm before threatening a member of security staff with weapons.
They stole £2500 in cash and fled the scene in a black/dark grey Audi RS6, believed to have been stolen and later abandoned in Chertsey.
The group were described as wearing all black clothing and balaclavas.
Anyone with any CCTV in the area is urged to contact police on 101.
