Hi Cath welcome,
The soil and wet weather will get rid of the vine weevil liquid (neutralise it), I would leave it for 6 months to a year, but you can still grow plants (flowers) there but not vegetables!
You just need to grow them someware else, in tubs or strong plastic bags! Try not to use chemicals on vegetables and go organic!
Soil removal is not necessary and will cost you thousands of pounds to do so.
Every Cloud Has A Silver Lining!
Regards
Redrose
