Smalley Hot Tub Services - PASTED OFF A HOT TUB GROUP, ITS NOT ME!!!!! Just seen this and i think I need to reiterate why you have an RCD on your pumps.
Bestway Lay-Z-Spa Replacement Rcd Plug & Cable- Model Kedu PD22B 10mA 16A IP66 for sale from United Kingdom
PD22B Personal Circuit Breaker 10 mA : Amazon.de: DIY & Tools