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blocked bath drain

This is a ground floor bath - it has suddenly blocked and got very slow, i have tried numerous drain cleaners and the plunger with no effect. have tried poking something up from outside but there is a 90deg corner just in from the outlet. total pipe length is probably not more than 2m and i believe is the plastic 32mm dia. access under the bath is very limited. i did wonder if an camera/endescope might be the 1st best option?