New uPVC bay windows

[Sambob15]

My 1960s house has old uPVC bay windows that I'd like to replace. The main issue is that the survey I had done when buying the house contains the following paragraph:

"The various lintels appear finished in brick, with no obvious indication of formal lintel support now required under Part L Building Regulations. Without damaging investigations we are unable to fully verify that the hidden lintels are free from rot or other defects. Our external inspection revealed no apparent deflection of brickwork above the respective openings to suggest adverse support, despite reveals of up to 50mm. No surface problems were evident internally or externally. However, if the existing windows are to be replaced, some upgrading of lintels should not be ruled out."

I've never had windows replaced before, so am not sure how I would go about finding out whether new lintels are needed as part of the job - would this be a window fitter that would advise and carry out the work? Or would I need to contact a builder?

Additionally, do you know how new lintels could be accessed/installed given that the area directly above the lower ground floor window is covered in tiling (which runs up to the next level bay window), and the area directly above the upper window is within the fascias/soffits?

Hopefully these pics will make things a bit clearer:

http://imageshack.com/a/img924/1275/aosLLz.jpg
http://imageshack.com/a/img922/5463/BynQpE.jpg
http://imageshack.com/a/img922/6375/9MfJIS.jpg

Many thanks.

 

[Gazman16]

There wont be any lintels in there and none required (bays at least).
The top window likely wont be baring any weight but the bottom one will be taking the weight of the timber frame, Tiles, Window above and probably some of the upstairs floor too.

As you already have PVC it is just a straight forward replacement that can be done by any window company.
Although your old ones most likely don't have "baypole jacks" new windows should be fitted with them.

Get quotes from local company's and avoid the big nationals.
You dont say why you want to change them? But have a look up and down your road for window styles that you like and maybe try to find out who fitted them.