Welcome to Flyertalk destone and welcome to the BA forum. It is great to see you here, and it would be even better if we see even more of you! So welcome on board and please make yourself at home here.

No, unfortunately you cannot use your dad's card, it is personal and any abuse of the card can / will lead to its cancellation. Using a card like this, if spotted, is considered a serious breach. Even if you have the same name as your father then there are things on the profile that - such as age and connection to the boarding pass - which could lead to a bad situation. So don't even try it, would be my advice.

However! We do have a lounge meet up thread elsewhere in this forum (see the Dashboard for the useful links), and particularly for London you have a reasonable chance that someone will be able to perhaps help you out. Maybe to a nicer lounge than Dad gets into, so just imagine the bragging rights!