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***Wow, with such a hard hit and some bent/broken components there is still a lot that could be off and causing the harmonics/vibration even after replacing bent/broken components.
An alignment can certainly have the vehicle tracking straight but with such a hard hit I would have a frame/body guy with knowledge check the car itself for squareness - the mounts (perches) the dampeners and other components bolt on to could have been damaged and literally lifted them out of square of the rest of the chassis, or cracked bushings/spherical bearings in other parts of the car from such a hard hit.
A wheel alignment and proper balancing of the tires can still mask an alignment or bent/out of square perch, or motor mount damage that only manifests itself at a particular speed that causes the vibration.
A static alignment is certainly helpful on the assumption the car itself is properly "squared" in all three dimensions. It takes a pretty experienced body/frame person to know what to look for and specialized frame/unibody frame alignment tools to fix. Any hit of that magnitude with a right vs left turn difference in vibration leads me to believe it is more than just a replacing components type of fix.
Get the vehicle to an experienced frame/body guy if your mechanic is not familiar with the measurements or doesn't have the tooling to do the proper assessment/checks for stress/impact/impulse induced frame/body damage.
£2,000 cost for that repair seems *very* low to me given what you describe had to be replaced. Tires/wheels, the wishbone, etc.. Those are not inexpensive parts so not much left to cover the significant time needed to assess and correct unibody/frame issues.
Good luck and hope this helps a bit.
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