Access to concealed plumbing

Hi I am looking for some advice on how to remove some box skirting in the bathroom of our Auto Sleepers Mayfair caravan .

At our recent service our mobile engineer found that some of the Whale (white) push fittings were showing signs of beginning to leak, apparently this is quite common with these. He suggested that we replace these with John Guest fittings, which from his experience were a much more reliable.

This I have managed to do for the vast majority which are readily accessible in various cupboards etc., but it appears there may be some fittings that are not readily accessible, due to being enclosed by a box type skirting around the bathroom floor between the toilet and vanity unit 

Does anyone have any experience of hoe this skirting mat be removed and eventually reinstated.

Thanks in anticipation.

Les