Yoga/Pilates/Other for flexibility

[LordGrover]

Long story short; I'm fairly fit and not fat.
Training wise I shift iron, cycle locally and walk a bit. No running or other sports.
One thing that I lack is flexibility - I struggle to even touch my toes without cheating. My joints are good and strong but lack full range of motion thanks to +50 years of sitting at desks, sofa and driving. My posterior chain in particular is poor, despite good form squatting and deadlifts.

Considering a class/course to try to improve things, also want to try working in a group as I've always been a solitary trainer and fancy a change.
My gym offers Hatha Yoga and Pilates but happy to consider other options that me be beneficial. I've read a little on the internets but any first hand advice would be great.

Ta.

[LordGrover]

Is that Australian Physiotherapy and Pilates Institute? Seems odd being Australian in the UK.

[LordGrover]

Thank you all.

Do any of you enjoy improved flexibility or is it for the fitness or plain, simple enjoyment?

I should add as well as stretching at the gym, I have a deep tissue sports massage a couple of times a month which helps a lot with recovery and potential aches & pains.

[LordGrover]

Update

I'm a few weeks into a six week one-to-one course in Dru Yoga. Despite just the three lessons I've been doing a few positions at home and at the gym and my flexibility is improving daily. Most notably my hips, hamstrings and shoulders - wish I'd discovered this years ago.

[LordGrover]

Impressive stuff dude.
It may take me a little longer to make that kind of progress but I've seen improvements already. Glad I went for one-to-one sessions to begin with because I'm pretty sure I'd've been embarrassed at how poor I was just a few weeks ago. Still trying to get downward dog and triangle right but at least my hips are beginning to move, a little.