Update! Got a bloke round (SOS Drainage Services) who when I spoke on the phone to him, he asked a few technical questions which put me at ease. I then asked the price – £80 for an hour. I asked if it sometime took longer than than as I was worried about escalating costs and he said “well if I can’t get it done in an hour it’s a bit of a poor do isn’t it?” – proper Yorkshire answer!!
Middle aged guy, slightly older van but had all the gear. True to his word it was sorted out in pretty much one hour but he did have to break out a lot of his gear to shift it and it took some head scratching via CCTV on how to move the jammed brick. He finished off by jetting my whole system to the road as he said it was blocked up a bit. £80 and no extra for CCTV usage etc.
Proper service from an old school professional. Will use again if I need to.