Damage by 3rd party company, not giving me their insurance

[l_nels]

My car was having some work done in a garage and they damaged the vehicle body work.

There is clear CCTV from another premises where the garage are clearly liable, but the garage are not giving me there insurance details.

My insurers Direct Line are suggesting that i make a claim on my own policy for the damage, but this dosnt seem right, that they get off scot free and im left with paying my excess and increased premiums.

Im thinking of issuing proceedings which i think i would clearly win, but they are a LTD co and could just fold the company.

Any ideas how to get a) there insurance details b) a resolution to the issue ?

[l_nels]

They where driving my vehicle and when they parked it didnt apply the hand brake correctly (eg didnt pull it up enough)