Just reporting back after my visit to the hospital today. Physio confirmed diagnosis as being compression of the nerve root by the bulging disc. Thankfully not to a degree that is causing weakness/loss of use in leg so surgery not an option (not that I would have wanted it anyway!). I was offered either a nerve root injection or physiotheryapy. I declined the injection and decided on the physio route first with a follow up hospital appointment in 6 months time. I think/hope I made the right decision!
Something that may help anyone else in a similar sitiation. If, like me, you are offered an NHS physio referral that has a long wait list (in my case 2 months), if you have not already been asked during the routine assessment/questions emphasise how much the pain is affecting your sleep - I am awake/up every 2 hours. This immediately qualified me for an urgent physio referral (1-2 weeks) so I am happy with that and will see how things go.