Effectively they’ll see you as a new driver so might be harder to get work initially depending on the various company policies, but up to Christmas you might find some. It’s after Christmas that things might get tricker with agencies as sometimes it falls off a cliffedge so they’ll tend to give work to the people with a longer driving history. If you’ll take on class C work then pallet companies might still be looking. Could also be worth investing in a refresher course especially if you’ve not had much to do with trucks recently - autoboxes are now the norm.
One thing though - have you done your 35 hours CPC in the past few years (ideally 3 or less). Guessing not if you’ve not driven for 8 years and it only lasts 5 years. So that’s likely another 500 quid or so to fork out and a week of your life which you may not survive (if boredom can kill). 
Also depending on your age, check when your HGV entitlement expires as you might need a new medical depending on age. That’s not stupidly expensive, usually about 50 - 80 quid.
With regards agencies - if you can get on PAYE you shouldn’t have anything more to pay beyond normal tax etc. but watch out for “umbrella schemes” and avoid LTD like the plague even if they claim you’ll get paid more - yeah you will because you’ve not paid the tax at that rate. The former charges you for doing your tax, and the latter stores up potential major tax problems. PAYE is the only way to go and there are agencies who will do it.
If you’re an experienced HGV fitter, are you sure there aren’t people who’ll take you on for 6 months? Seems to be very good pay compared to driving and some places might give you a job as a shunter / fitter. No CPC, tacho card, medical usually required.
Btw, don’t believe most of the ads you see on Indeed etc. 95% don’t exist especially when they mention “blue chip companies” and “trunking”. Who’s ever seen a blue chip!?