Just for info for anyone here using Intal and needing a spacer. On the advice of someone else here, I contacted the manufactures of the inhaler - it took a bit of going back and forth between them, the pharmacist and my GP, but the manufacturers have now sent me (via the pharmacist) a free Fisonair large volume spacer which fits and is suitable for the Intal inhaler.
Definitely worth knowing about and may apply to other inhalers/manufacterers too.