Medical products, apparatus and instruments including nebulisers and parts and accessories therefor, nebuliser systems and kits comprising bowls, masks, mouthpieces, nose pieces and air tubing, allergy and asthma care products, cases fitted for medical instruments, peak flow meters, masks for medical use, aerosol dispensers for medical purposes and aerosol dispenser accessories including aerosol dispenser bowls, aerosol dispenser mouth pieces, aerosol dispenser nose pieces and aerosol dispenser tubing, tubing for medical purposes