Make sure the incomming services go your property ate bonded. Mains water stopcock (under kitchen sink/Utility room sink) if the pipe coming out of the floor before the stopcock is copper then a earth cable must be affixed to the copper pipe above the stopcock (green & yellow cable diameter of a drinking straw)
Same with the gas pipe work might be bonded within the gas meter box external to the property if nothing is visible it may be done at the boiler or possibly under the floor. This can be verified on date of install but if nothings present the installation may not go.ahead or if it is completed the pod will be left disabled until bonding is installed and verified.
In regards to mains fuse, Pod comes with a fuse saver feature that limits the pods drawn dependant upon the homes current consumption out the box its set to 60 so a 60A mains fuse (in my opinion can be left in place.....this is my opinion and not that of PodPoint) limit can also. E lowered if the Pod is to be supplied from a board within a garage.