MDE contact address (valves)

I'm trying to find a good contact email and/or phone number for MDE as
I need to talk to them about metric valves with burst discs.

I've got an old style (facing o-rings) MDE isolation manifold and I
just want to (If possible) replace the valves with ones with burst
discs fitted (for use in New Zealand).

If anyone has a contact email and/or phone number I'd really appreciate
it - I only found mde@aqualung.co.uk by googling and thought maybe
someone had something better.

I'm also interested in any other ideas that anyone has on this matter
- This just looks like the cheapest way to go for now.

Thanks,

Dan.