In the past 18 months or so, we've noticed sellers coming to us for a lastminute.com EICR because the seller has asked for one, usually a few days or weeks leading up to the selling date. We tell our clients this: To avoid the extra stress, tell the buyer well ahead of time to commission their own EICR, with an electrician on their own choosing, that way there is no chance of this being dropped in your lap at the final hour, and there is no come back on you at a later date.
The only real way of telling whether your electrics are completely safe is by having a thorough health check on the electrics (EICR) carried out by an experienced electrician. We specialise in these - please find out more here.