Here is an extract from what Bob, the organiser, posted on the Ilkley Harriers web site the other day ..
"The start will be at the Lower Tarn, as now has become custom, with registration opposite Darwin Gardens. As low-key and informal as ever, the idea is to get to Dick Hudson's and back, via any route you like, in any manner you like."
So, parking and registration below White Wells on Wells Rd, just like the Ilkley Moor fell race. Start from the tarn that you pass just after the start of the Ilkley Moor fell race, ie a few minute's jog away.
A quick glance at an OS map shows it's 10k as the crow flies.
There's an interesting road bike option (via Burley etc.), but I'm guessing that "in any manner you like" doesn't include car, gyrocopter, etc.?