What kind of repair kit are you looking for? If it's something to repair a rip in the fabric, then Tenacious Tape is clear & strong. Or is it a broken pole or shock cord you need to repair?
Any camping shop will sell
spare poles, (check your diameter, some tents have several diffent sizes),
elastic shock cord,
seam sealant .
In my repair kit is also spare guylines,
tenacious tape for flysheet repairs
, scissors,
A junior hacksaw(in case poles need cutting to size )
ductape will repair torn groundshets, or can be wrapped around a split pole that hasn't snapped completely, for a short term repair.
Duct tape, clingons, guy rope, ground sheet pegs, inner tent clips, pliers, hammer, screwdriver, plus spare set of poles for small tent. - Thats our tent repair kit.
When we had a zip break in our Lichfield frame tent we took it to our local campshop as they have a repairers on site - it cost £50! Still we managed to sell the tent for £50 - it would probably not sold for that if the zip had not been repaired.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.