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Hi you dont say how big the hole is but if you have a screwfix store nearby and you have the measurements they sell things like this http://www.screwfix.com/p/floplast-screwed-access-cap/72385?cm_sp=Search-_-SearchRec-_-Area1&_requestid=149672
Sorry I though about adding the size then forgot - its about 3inches across
Yes just viewed screww fix website and that looks look for a permanant solution, but I would know how to thread the wires/ cables through that - I assume an electrician would need to come and and feed through?