Kall kwick have bracnches all over the place, i get mine done at a local indipendant place, they do pay per print or you can pay up front £100 at a time and just email your drawings through, and collect later on.
If the file(s) is in .PDF format you can print tiled PDF pages and assemble into a larger sheet. On commercial and industrial jobs I insist on full-size prints from the original designers/architects drawings as part of my terms and conditions, because in PDF it can lack detail at low magnification, or be expensive to achieve the detail required and time consuming to compile tiled PDF pages on large job.
If the file(s) are in Autocad .DWG format you ideally need to find a local reprographic outlet, college/university or drawing office which has either an A0 pen-plotter or printer/copier, A1 or A2 at a pinch if the drawing is not too complex or with fine detail.
If you have hard copy drawings/plans to be copied you ideally need to find a local reprographic outlet, college/university or drawing office which has an A0 printer/copier, A1 or A2 at a pinch if the drawing is not too complex or with fine detail.
On commercial and industrial jobs I insist on receiving full-size prints of the original drawings from the designer or architect as part of my terms and conditions. Because, as E54 pointed out, the reprographic cost can be substantial and avoids scaling issues.
If you look around and have the space, old A0 pen plotters (now largely out of fashion but perfectly workable) are not fetching much on fleabay as people want inkjets instead. If not, I can normally manage with A3 size just as working drawings on site.