I agree with RedSVT. I'm glad we're getting two replies in before someone chimes in with "your gearbox is shot."
In addition to double-clutching (don't the Brits say double-declutching?) as RedSVT describes, another option is to push the lever into a higher gear (say, 4th), then go back to first. That may be enough to "nudge" the layshaft just enough to let the dog teeth engage first gear.
Have fun with your SVT! You made a great decision.
