I think that's perception because a few big names appear to be missing, rather than the reality. Replacing 5 or 6 3rd division domestic teams with the same number of WT teams can only strengthen the depth of field. London is a "second tier" WT race, whereas Poland and San Sebastian are established top tier WT events, so perhaps no surprise they have more pulling power at this stage. That said, I do not buy the arguments in commentary that this is an iconic race with testing parcours and that teams are clambering to race it. Lincoln GP would be a more entertaining parcours and there would be bigger crowds in Yorkshire villages. The majority of WT teams are here because the organiser did a deal with Velon (no doubt at a cost) to guarantee their attendance.