The centre enjoys anniversary celebrations, Gordon's brother - the Reverend Horatio Brittas - is visiting and thirty six staff from a leisure centre in Guildford are visiting for their annual staff outing. As always things do not run smoothly: the centre's oil tank begins leaking, the leaked oil is then brought inside and stored in the weights room to prevent it from being struck by lightning - but a firework is accidentally set off in Brittas's office, which finds its way along the corridor to the weights room, resulting in a large explosion and fire.