Here is what CIVL Section 7A says:

8. 5.1 Free Flyers

Free flyers and personnel associated with teams must not be permitted to fly the
tasks or sections of it; it is particularly important that they do not approach
goal fields.

Here is what Dave May tweeted yesterday:

free flew to goal!

A complaint has been lodged. The complaint states that Steve Moyes was witnessed to be at goal.

2. 19 External aid to competitors

The following limitations are so that, as far as possible, the contest shall be
between individual competitors, neither helped nor controlled by external aids.

2. 19.1 Navigation

Any help in navigation or thermal location by any non-competing aircraft,
including competing gliders not in the act of carrying out the task of their own
class, is prohibited. Pre-fliers (Wind dummies) must land or fly in a designated
area as soon as possible after task flying has started (see Chapter 8,
Pre-fliers).

I'll further investigate the circumstances.

The complaining pilots want to be sure that free flyers are not allowed to fly on the course as per the CIVL rules.