As MikeJeff says, there's no need for prioir notice of your arrival at Le Touquet since they're a full-time Customs field, now with scheduled flights from Shoreham as well as the Trislanders from Lydd.
In theory, LeT has been a full-time Customs airfield for years.
BUT, has anyone actually found a Customs person there this year?
BUT, the marshaller (no uniform - no high-viz waistcoat - one handed signals over his shoulder to aircraft) is back in action on his "Follow-me-push-bike"