My buddy doing part time work from town with deliveroo & uberfoods working from town, he also uses one of those rent a bikes you see in town if you don't have a bike/car, last month he told me he was making £50-80 a day & that includes the cost of the bike rental, all you need is a smart mobile phone/hi vis top/cycle helm & some tools for repairs, but with rental bike if it breaks you just take it to a stand that are all over the town & get a new one, 2 weeks ago he showed me the app he uses & he was already at £89 inc tips for that day & he was only 6 hours into his planned shift, the good thing is you work when you want so your basically your own boss, he is pretty fit so he says he can do 5-10 delivery an hour you just need to plan your order ahead as you get orders for burger king/mcdonalds ect & you call them up otw to collect the food & it ready 4 u when you get there, then you pay for the order using the app so you don't even need to have cash on you, but he gets alot of tips from people at the door even though they already paid for it using there bank card.
https://www.uber.com/en-GB/drive/delivery/
nextbike rental https://www.nextbike.co.uk/en/glasgow/prices/
cheap hi vis top (make a gmail.com account to get a month free trial of prime then you get free delivery) https://www.amazon.co.uk/dp/B0055RVAHA/ref=twister_B01MFD8PIE