Conservatory problems

rebs333

Sorry if this rambles on and goes off at a tangent but looking for peoples thoughts/ideas.
In 2010 I bought a mid terrace house that had a wooden (Edwardian?) conservatory. This had a poly-carb roof and all was fine until ... About 18 months ago my neighbour and I had a rat problem. While we were sorting this out the Water company did a drain inspection and told me that me conservatory was built over a man-hole cover (under a tiled floor) which they couldn't access and this might be the source of the rats. Thankfully by blocking up access points in the loft the problem was sorted but obviously I now know about this issue! and that there may be future problems. I am thinking that at worse, I would need to dig up conservatory floor/possibly re-route drain? obviously costing £££ but I am thinking of leaving this until I have to. Whilst looking at conservatory problems on the internet, I discovered that I should have a door between the conservatory and my house. The access to it is a gap where the back door used to be and is from a very small galley kitchen. I didn't know about this issue or the drain when I bought the property although I did have a survey.
So I had been thinking about how in a few years I could replace the conservatory roof for a glass one (or the whole conservatory) due to noise/heat etc but now think what if I did that and then there was a problem with the drains? What about the lack of door or wouldn't this matter if I was only replacing the roof. Should I just leave everything as it is ?. I would appreciate any thoughts or any aspect of this saga !
For info I am not planning on moving. The roof is for a few years time. I have limited funds so I am saving for an emergency fund to cover any future drain problems