Aye a lot of local outfits will charge less if you pay by cash, worth keeping note and always asking for a cash price 
The bodyshop I use, for example, will either split the VAT for large jobs whether it's cash or card or not charge the VAT if it's a small job.

The bodyshop I use, for example, will either split the VAT for large jobs whether it's cash or card or not charge the VAT if it's a small job.