Anyone help me I work Monday - Friday class 1. Looking to do every other sat on agency. Will it be worth it paying more tax on the 2nd job. Just looking for advise or if anyone else has done it before
First I’d check if your current employer will allow it,some won’t.
just be careful where agency are concerned , I worked in a engineering factory mon- fri and did some agency , one week I started 6 am fri in the factory and finished 14.00 , the agency asked me if I could work fri evening for b& q Grantham ( I said I was working in factory sat morn so it had to be a very short run , no problem , I got to b& q for 18.00 & bloke gave me keys and said Gretna , where , you don’t know Gretna , only Gretna green , yep meet jock at services and change over 
, agency wernt answering phone ( there’s a suprise , so got there & jocks arrived about 3 hrs later , changed over and got back to Grantham and left at 5.30 then did 6 -12/14.00 ( can’t rember which i ) , I was like a zombie 6 fri - 12.00/14.00 sat with a 4 hr break for some tea 
, that was enough , I went full time driving , then one job was 17.30- 23.30, 30 hrs a week so did 1 sat , boss found out , said nothing but changed job so I had tip a load on a sat .
Like I say it all sounds simple but once you involve agency and childish bosses it gets hard work